include/regex

// -*- C++ -*-
//===--------------------------- regex ------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_REGEX
#define _LIBCPP_REGEX

/*
 regex synopsis

#include <initializer_list>

namespace std
{

namespace regex_constants
{

emum syntax_option_type
{
 icase = unspecified,
 nosubs = unspecified,
 optimize = unspecified,
 collate = unspecified,
 ECMAScript = unspecified,
 basic = unspecified,
 extended = unspecified,
 awk = unspecified,
 grep = unspecified,
 egrep = unspecified
};

constexpr syntax_option_type operator~(syntax_option_type f);
constexpr syntax_option_type operator&(syntax_option_type lhs, syntax_option_type rhs);
constexpr syntax_option_type operator|(syntax_option_type lhs, syntax_option_type rhs);

enum match_flag_type
{
 match_default = 0,
 match_not_bol = unspecified,
 match_not_eol = unspecified,
 match_not_bow = unspecified,
 match_not_eow = unspecified,
 match_any = unspecified,
 match_not_null = unspecified,
 match_continuous = unspecified,
 match_prev_avail = unspecified,
 format_default = 0,
 format_sed = unspecified,
 format_no_copy = unspecified,
 format_first_only = unspecified
};

constexpr match_flag_type operator~(match_flag_type f);
constexpr match_flag_type operator&(match_flag_type lhs, match_flag_type rhs);
constexpr match_flag_type operator|(match_flag_type lhs, match_flag_type rhs);

enum error_type
{
 error_collate = unspecified,
 error_ctype = unspecified,
 error_escape = unspecified,
 error_backref = unspecified,
 error_brack = unspecified,
 error_paren = unspecified,
 error_brace = unspecified,
 error_badbrace = unspecified,
 error_range = unspecified,
 error_space = unspecified,
 error_badrepeat = unspecified,
 error_complexity = unspecified,
 error_stack = unspecified
};

} // regex_constants

class regex_error
 : public runtime_error
{
public:
 explicit regex_error(regex_constants::error_type ecode);
 regex_constants::error_type code() const;
};

template <class charT>
struct regex_traits
{
public:
 typedef charT char_type;
 typedef basic_string<char_type> string_type;
 typedef locale locale_type;
 typedef /bitmask_type/ char_class_type;

 regex_traits();

 static size_t length(const char_type* p);
 charT translate(charT c) const;
 charT translate_nocase(charT c) const;
 template <class ForwardIterator>
 string_type
 transform(ForwardIterator first, ForwardIterator last) const;
 template <class ForwardIterator>
 string_type
 transform_primary( ForwardIterator first, ForwardIterator last) const;
 template <class ForwardIterator>
 string_type
 lookup_collatename(ForwardIterator first, ForwardIterator last) const;
 template <class ForwardIterator>
 char_class_type
 lookup_classname(ForwardIterator first, ForwardIterator last,
 bool icase = false) const;
 bool isctype(charT c, char_class_type f) const;
 int value(charT ch, int radix) const;
 locale_type imbue(locale_type l);
 locale_type getloc()const;
};

template <class charT, class traits = regex_traits<charT>>
class basic_regex
{
public:
 // types:
 typedef charT value_type;
 typedef regex_constants::syntax_option_type flag_type;
 typedef typename traits::locale_type locale_type;

 // constants:
 static constexpr regex_constants::syntax_option_type icase = regex_constants::icase;
 static constexpr regex_constants::syntax_option_type nosubs = regex_constants::nosubs;
 static constexpr regex_constants::syntax_option_type optimize = regex_constants::optimize;
 static constexpr regex_constants::syntax_option_type collate = regex_constants::collate;
 static constexpr regex_constants::syntax_option_type ECMAScript = regex_constants::ECMAScript;
 static constexpr regex_constants::syntax_option_type basic = regex_constants::basic;
 static constexpr regex_constants::syntax_option_type extended = regex_constants::extended;
 static constexpr regex_constants::syntax_option_type awk = regex_constants::awk;
 static constexpr regex_constants::syntax_option_type grep = regex_constants::grep;
 static constexpr regex_constants::syntax_option_type egrep = regex_constants::egrep;

 // construct/copy/destroy:
 basic_regex();
 explicit basic_regex(const charT* p, flag_type f = regex_constants::ECMAScript);
 basic_regex(const charT* p, size_t len, flag_type f);
 basic_regex(const basic_regex&);
 basic_regex(basic_regex&&) noexcept;
 template <class ST, class SA>
 explicit basic_regex(const basic_string<charT, ST, SA>& p,
 flag_type f = regex_constants::ECMAScript);
 template <class ForwardIterator>
 basic_regex(ForwardIterator first, ForwardIterator last,
 flag_type f = regex_constants::ECMAScript);
 basic_regex(initializer_list<charT>, flag_type = regex_constants::ECMAScript);

 ~basic_regex();

 basic_regex& operator=(const basic_regex&);
 basic_regex& operator=(basic_regex&&) noexcept;
 basic_regex& operator=(const charT* ptr);
 basic_regex& operator=(initializer_list<charT> il);
 template <class ST, class SA>
 basic_regex& operator=(const basic_string<charT, ST, SA>& p);

 // assign:
 basic_regex& assign(const basic_regex& that);
 basic_regex& assign(basic_regex&& that) noexcept;
 basic_regex& assign(const charT* ptr, flag_type f = regex_constants::ECMAScript);
 basic_regex& assign(const charT* p, size_t len, flag_type f);
 template <class string_traits, class A>
 basic_regex& assign(const basic_string<charT, string_traits, A>& s,
 flag_type f = regex_constants::ECMAScript);
 template <class InputIterator>
 basic_regex& assign(InputIterator first, InputIterator last,
 flag_type f = regex_constants::ECMAScript);
 basic_regex& assign(initializer_list<charT>, flag_type = regex_constants::ECMAScript);

 // const operations:
 unsigned mark_count() const;
 flag_type flags() const;

 // locale:
 locale_type imbue(locale_type loc);
 locale_type getloc() const;

 // swap:
 void swap(basic_regex&);
};

typedef basic_regex<char> regex;
typedef basic_regex<wchar_t> wregex;

template <class charT, class traits>
 void swap(basic_regex<charT, traits>& e1, basic_regex<charT, traits>& e2);

template <class BidirectionalIterator>
class sub_match
 : public pair<BidirectionalIterator, BidirectionalIterator>
{
public:
 typedef typename iterator_traits<BidirectionalIterator>::value_type value_type;
 typedef typename iterator_traits<BidirectionalIterator>::difference_type difference_type;
 typedef BidirectionalIterator iterator;
 typedef basic_string<value_type> string_type;

 bool matched;

 constexpr sub_match();

 difference_type length() const;
 operator string_type() const;
 string_type str() const;

 int compare(const sub_match& s) const;
 int compare(const string_type& s) const;
 int compare(const value_type* s) const;
};

typedef sub_match<const char*> csub_match;
typedef sub_match<const wchar_t*> wcsub_match;
typedef sub_match<string::const_iterator> ssub_match;
typedef sub_match<wstring::const_iterator> wssub_match;

template <class BiIter>
 bool
 operator==(const sub_match<BiIter>& lhs, const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator!=(const sub_match<BiIter>& lhs, const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator<(const sub_match<BiIter>& lhs, const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator<=(const sub_match<BiIter>& lhs, const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator>=(const sub_match<BiIter>& lhs, const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator>(const sub_match<BiIter>& lhs, const sub_match<BiIter>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator==(const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator!=(const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator<(const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator>(const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter, class ST, class SA>
 bool operator>=(const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator<=(const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator==(const sub_match<BiIter>& lhs,
 const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator!=(const sub_match<BiIter>& lhs,
 const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator<(const sub_match<BiIter>& lhs,
 const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& rhs);

template <class BiIter, class ST, class SA>
 bool operator>(const sub_match<BiIter>& lhs,
 const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator>=(const sub_match<BiIter>& lhs,
 const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& rhs);

template <class BiIter, class ST, class SA>
 bool
 operator<=(const sub_match<BiIter>& lhs,
 const basic_string<typename iterator_traits<BiIter>::value_type, ST, SA>& rhs);

template <class BiIter>
 bool
 operator==(typename iterator_traits<BiIter>::value_type const* lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator!=(typename iterator_traits<BiIter>::value_type const* lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator<(typename iterator_traits<BiIter>::value_type const* lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator>(typename iterator_traits<BiIter>::value_type const* lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator>=(typename iterator_traits<BiIter>::value_type const* lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator<=(typename iterator_traits<BiIter>::value_type const* lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator==(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const* rhs);

template <class BiIter>
 bool
 operator!=(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const* rhs);

template <class BiIter>
 bool
 operator<(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const* rhs);

template <class BiIter>
 bool
 operator>(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const* rhs);

template <class BiIter>
 bool
 operator>=(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const* rhs);

template <class BiIter>
 bool
 operator<=(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const* rhs);

template <class BiIter>
 bool
 operator==(typename iterator_traits<BiIter>::value_type const& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator!=(typename iterator_traits<BiIter>::value_type const& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator<(typename iterator_traits<BiIter>::value_type const& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator>(typename iterator_traits<BiIter>::value_type const& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator>=(typename iterator_traits<BiIter>::value_type const& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator<=(typename iterator_traits<BiIter>::value_type const& lhs,
 const sub_match<BiIter>& rhs);

template <class BiIter>
 bool
 operator==(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const& rhs);

template <class BiIter>
 bool
 operator!=(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const& rhs);

template <class BiIter>
 bool
 operator<(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const& rhs);

template <class BiIter>
 bool
 operator>(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const& rhs);

template <class BiIter>
 bool
 operator>=(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const& rhs);

template <class BiIter>
 bool
 operator<=(const sub_match<BiIter>& lhs,
 typename iterator_traits<BiIter>::value_type const& rhs);

template <class charT, class ST, class BiIter>
 basic_ostream<charT, ST>&
 operator<<(basic_ostream<charT, ST>& os, const sub_match<BiIter>& m);

template <class BidirectionalIterator,
 class Allocator = allocator<sub_match<BidirectionalIterator>>>
class match_results
{
public:
 typedef sub_match<BidirectionalIterator> value_type;
 typedef const value_type& const_reference;
 typedef value_type& reference;
 typedef /implementation-defined/ const_iterator;
 typedef const_iterator iterator;
 typedef typename iterator_traits<BidirectionalIterator>::difference_type difference_type;
 typedef typename allocator_traits<Allocator>::size_type size_type;
 typedef Allocator allocator_type;
 typedef typename iterator_traits<BidirectionalIterator>::value_type char_type;
 typedef basic_string<char_type> string_type;

 // construct/copy/destroy:
 explicit match_results(const Allocator& a = Allocator());
 match_results(const match_results& m);
 match_results(match_results&& m) noexcept;
 match_results& operator=(const match_results& m);
 match_results& operator=(match_results&& m);
 ~match_results();

 bool ready() const;

 // size:
 size_type size() const;
 size_type max_size() const;
 bool empty() const;

 // element access:
 difference_type length(size_type sub = 0) const;
 difference_type position(size_type sub = 0) const;
 string_type str(size_type sub = 0) const;
 const_reference operator[](size_type n) const;

 const_reference prefix() const;
 const_reference suffix() const;

 const_iterator begin() const;
 const_iterator end() const;
 const_iterator cbegin() const;
 const_iterator cend() const;

 // format:
 template <class OutputIter>
 OutputIter
 format(OutputIter out, const char_type* fmt_first,
 const char_type* fmt_last,
 regex_constants::match_flag_type flags = regex_constants::format_default) const;
 template <class OutputIter, class ST, class SA>
 OutputIter
 format(OutputIter out, const basic_string<char_type, ST, SA>& fmt,
 regex_constants::match_flag_type flags = regex_constants::format_default) const;
 template <class ST, class SA>
 basic_string<char_type, ST, SA>
 format(const basic_string<char_type, ST, SA>& fmt,
 regex_constants::match_flag_type flags = regex_constants::format_default) const;
 string_type
 format(const char_type* fmt,
 regex_constants::match_flag_type flags = regex_constants::format_default) const;

 // allocator:
 allocator_type get_allocator() const;

 // swap:
 void swap(match_results& that);
};

typedef match_results<const char*> cmatch;
typedef match_results<const wchar_t*> wcmatch;
typedef match_results<string::const_iterator> smatch;
typedef match_results<wstring::const_iterator> wsmatch;

template <class BidirectionalIterator, class Allocator>
 bool
 operator==(const match_results<BidirectionalIterator, Allocator>& m1,
 const match_results<BidirectionalIterator, Allocator>& m2);

template <class BidirectionalIterator, class Allocator>
 bool
 operator!=(const match_results<BidirectionalIterator, Allocator>& m1,
 const match_results<BidirectionalIterator, Allocator>& m2);

template <class BidirectionalIterator, class Allocator>
 void
 swap(match_results<BidirectionalIterator, Allocator>& m1,
 match_results<BidirectionalIterator, Allocator>& m2);

template <class BidirectionalIterator, class Allocator, class charT, class traits>
 bool
 regex_match(BidirectionalIterator first, BidirectionalIterator last,
 match_results<BidirectionalIterator, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class BidirectionalIterator, class charT, class traits>
 bool
 regex_match(BidirectionalIterator first, BidirectionalIterator last,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class charT, class Allocator, class traits>
 bool
 regex_match(const charT* str, match_results<const charT*, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class ST, class SA, class Allocator, class charT, class traits>
 bool
 regex_match(const basic_string<charT, ST, SA>& s,
 match_results<typename basic_string<charT, ST, SA>::const_iterator, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class ST, class SA, class Allocator, class charT, class traits>
 bool
 regex_match(const basic_string<charT, ST, SA>&& s,
 match_results<typename basic_string<charT, ST, SA>::const_iterator, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default) = delete; // C++14

template <class charT, class traits>
 bool
 regex_match(const charT* str, const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class ST, class SA, class charT, class traits>
 bool
 regex_match(const basic_string<charT, ST, SA>& s,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class BidirectionalIterator, class Allocator, class charT, class traits>
 bool
 regex_search(BidirectionalIterator first, BidirectionalIterator last,
 match_results<BidirectionalIterator, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class BidirectionalIterator, class charT, class traits>
 bool
 regex_search(BidirectionalIterator first, BidirectionalIterator last,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class charT, class Allocator, class traits>
 bool
 regex_search(const charT* str, match_results<const charT*, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class charT, class traits>
 bool
 regex_search(const charT* str, const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class ST, class SA, class charT, class traits>
 bool
 regex_search(const basic_string<charT, ST, SA>& s,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class ST, class SA, class Allocator, class charT, class traits>
 bool
 regex_search(const basic_string<charT, ST, SA>& s,
 match_results<typename basic_string<charT, ST, SA>::const_iterator, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class ST, class SA, class Allocator, class charT, class traits>
 bool
 regex_search(const basic_string<charT, ST, SA>&& s,
 match_results<typename basic_string<charT, ST, SA>::const_iterator, Allocator>& m,
 const basic_regex<charT, traits>& e,
 regex_constants::match_flag_type flags = regex_constants::match_default) = delete; // C++14

template <class OutputIterator, class BidirectionalIterator,
 class traits, class charT, class ST, class SA>
 OutputIterator
 regex_replace(OutputIterator out,
 BidirectionalIterator first, BidirectionalIterator last,
 const basic_regex<charT, traits>& e,
 const basic_string<charT, ST, SA>& fmt,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class OutputIterator, class BidirectionalIterator,
 class traits, class charT>
 OutputIterator
 regex_replace(OutputIterator out,
 BidirectionalIterator first, BidirectionalIterator last,
 const basic_regex<charT, traits>& e, const charT* fmt,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class traits, class charT, class ST, class SA, class FST, class FSA>>
 basic_string<charT, ST, SA>
 regex_replace(const basic_string<charT, ST, SA>& s,
 const basic_regex<charT, traits>& e,
 const basic_string<charT, FST, FSA>& fmt,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class traits, class charT, class ST, class SA>
 basic_string<charT, ST, SA>
 regex_replace(const basic_string<charT, ST, SA>& s,
 const basic_regex<charT, traits>& e, const charT* fmt,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class traits, class charT, class ST, class SA>
 basic_string<charT>
 regex_replace(const charT* s,
 const basic_regex<charT, traits>& e,
 const basic_string<charT, ST, SA>& fmt,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class traits, class charT>
 basic_string<charT>
 regex_replace(const charT* s,
 const basic_regex<charT, traits>& e,
 const charT* fmt,
 regex_constants::match_flag_type flags = regex_constants::match_default);

template <class BidirectionalIterator,
 class charT = typename iterator_traits< BidirectionalIterator>::value_type,
 class traits = regex_traits<charT>>
class regex_iterator
{
public:
 typedef basic_regex<charT, traits> regex_type;
 typedef match_results<BidirectionalIterator> value_type;
 typedef ptrdiff_t difference_type;
 typedef const value_type* pointer;
 typedef const value_type& reference;
 typedef forward_iterator_tag iterator_category;

 regex_iterator();
 regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type& re,
 regex_constants::match_flag_type m = regex_constants::match_default);
 regex_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type&& __re,
 regex_constants::match_flag_type __m 
 = regex_constants::match_default) = delete; // C++14
 regex_iterator(const regex_iterator&);
 regex_iterator& operator=(const regex_iterator&);

 bool operator==(const regex_iterator&) const;
 bool operator!=(const regex_iterator&) const;

 const value_type& operator*() const;
 const value_type* operator->() const;

 regex_iterator& operator++();
 regex_iterator operator++(int);
};

typedef regex_iterator<const char*> cregex_iterator;
typedef regex_iterator<const wchar_t*> wcregex_iterator;
typedef regex_iterator<string::const_iterator> sregex_iterator;
typedef regex_iterator<wstring::const_iterator> wsregex_iterator;

template <class BidirectionalIterator,
 class charT = typename iterator_traits< BidirectionalIterator>::value_type,
 class traits = regex_traits<charT>>
class regex_token_iterator
{
public:
 typedef basic_regex<charT, traits> regex_type;
 typedef sub_match<BidirectionalIterator> value_type;
 typedef ptrdiff_t difference_type;
 typedef const value_type* pointer;
 typedef const value_type& reference;
 typedef forward_iterator_tag iterator_category;

 regex_token_iterator();
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type& re, int submatch = 0,
 regex_constants::match_flag_type m = regex_constants::match_default);
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type&& re, int submatch = 0,
 regex_constants::match_flag_type m = regex_constants::match_default) = delete; // C++14
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type& re, const vector<int>& submatches,
 regex_constants::match_flag_type m = regex_constants::match_default);
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type&& re, const vector<int>& submatches,
 regex_constants::match_flag_type m = regex_constants::match_default) = delete; // C++14
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type& re, initializer_list<int> submatches,
 regex_constants::match_flag_type m = regex_constants::match_default);
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type&& re, initializer_list<int> submatches,
 regex_constants::match_flag_type m = regex_constants::match_default) = delete; // C++14
 template <size_t N>
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type& re, const int (&submatches)[N],
 regex_constants::match_flag_type m = regex_constants::match_default);
 template <size_t N>
 regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b,
 const regex_type& re, const int (&submatches)[N],
 regex_constants::match_flag_type m = regex_constants::match_default) = delete // C++14;
 regex_token_iterator(const regex_token_iterator&);
 regex_token_iterator& operator=(const regex_token_iterator&);

 bool operator==(const regex_token_iterator&) const;
 bool operator!=(const regex_token_iterator&) const;

 const value_type& operator*() const;
 const value_type* operator->() const;

 regex_token_iterator& operator++();
 regex_token_iterator operator++(int);
};

typedef regex_token_iterator<const char*> cregex_token_iterator;
typedef regex_token_iterator<const wchar_t*> wcregex_token_iterator;
typedef regex_token_iterator<string::const_iterator> sregex_token_iterator;
typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator;

} // std
*/

#include <__config>
#include <stdexcept>
#include <__locale>
#include <initializer_list>
#include <utility>
#include <iterator>
#include <string>
#include <memory>
#include <vector>
#include <deque>

#include <__undef_min_max>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

namespace regex_constants
{

// syntax_option_type

enum syntax_option_type
{
 icase = 1 << 0,
 nosubs = 1 << 1,
 optimize = 1 << 2,
 collate = 1 << 3,
 ECMAScript = 0,
 basic = 1 << 4,
 extended = 1 << 5,
 awk = 1 << 6,
 grep = 1 << 7,
 egrep = 1 << 8
};

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
syntax_option_type
operator~(syntax_option_type __x)
{
 return syntax_option_type(~int(__x) & 0x1FF);
}

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
syntax_option_type
operator&(syntax_option_type __x, syntax_option_type __y)
{
 return syntax_option_type(int(__x) & int(__y));
}

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
syntax_option_type
operator|(syntax_option_type __x, syntax_option_type __y)
{
 return syntax_option_type(int(__x) | int(__y));
}

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
syntax_option_type
operator^(syntax_option_type __x, syntax_option_type __y)
{
 return syntax_option_type(int(__x) ^ int(__y));
}

inline _LIBCPP_INLINE_VISIBILITY
syntax_option_type&
operator&=(syntax_option_type& __x, syntax_option_type __y)
{
 __x = __x & __y;
 return __x;
}

inline _LIBCPP_INLINE_VISIBILITY
syntax_option_type&
operator|=(syntax_option_type& __x, syntax_option_type __y)
{
 __x = __x | __y;
 return __x;
}

inline _LIBCPP_INLINE_VISIBILITY
syntax_option_type&
operator^=(syntax_option_type& __x, syntax_option_type __y)
{
 __x = __x ^ __y;
 return __x;
}

// match_flag_type

enum match_flag_type
{
 match_default = 0,
 match_not_bol = 1 << 0,
 match_not_eol = 1 << 1,
 match_not_bow = 1 << 2,
 match_not_eow = 1 << 3,
 match_any = 1 << 4,
 match_not_null = 1 << 5,
 match_continuous = 1 << 6,
 match_prev_avail = 1 << 7,
 format_default = 0,
 format_sed = 1 << 8,
 format_no_copy = 1 << 9,
 format_first_only = 1 << 10,
 __no_update_pos = 1 << 11
};

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
match_flag_type
operator~(match_flag_type __x)
{
 return match_flag_type(~int(__x) & 0x0FFF);
}

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
match_flag_type
operator&(match_flag_type __x, match_flag_type __y)
{
 return match_flag_type(int(__x) & int(__y));
}

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
match_flag_type
operator|(match_flag_type __x, match_flag_type __y)
{
 return match_flag_type(int(__x) | int(__y));
}

inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
match_flag_type
operator^(match_flag_type __x, match_flag_type __y)
{
 return match_flag_type(int(__x) ^ int(__y));
}

inline _LIBCPP_INLINE_VISIBILITY
match_flag_type&
operator&=(match_flag_type& __x, match_flag_type __y)
{
 __x = __x & __y;
 return __x;
}

inline _LIBCPP_INLINE_VISIBILITY
match_flag_type&
operator|=(match_flag_type& __x, match_flag_type __y)
{
 __x = __x | __y;
 return __x;
}

inline _LIBCPP_INLINE_VISIBILITY
match_flag_type&
operator^=(match_flag_type& __x, match_flag_type __y)
{
 __x = __x ^ __y;
 return __x;
}

enum error_type
{
 error_collate = 1,
 error_ctype,
 error_escape,
 error_backref,
 error_brack,
 error_paren,
 error_brace,
 error_badbrace,
 error_range,
 error_space,
 error_badrepeat,
 error_complexity,
 error_stack,
 __re_err_grammar,
 __re_err_empty,
 __re_err_unknown
};

} // regex_constants

class _LIBCPP_EXCEPTION_ABI regex_error
 : public runtime_error
{
 regex_constants::error_type __code_;
public:
 explicit regex_error(regex_constants::error_type __ecode);
 virtual ~regex_error() throw();
 _LIBCPP_INLINE_VISIBILITY
 regex_constants::error_type code() const {return __code_;}
};

template <class _CharT>
struct _LIBCPP_TYPE_VIS_ONLY regex_traits
{
public:
 typedef _CharT char_type;
 typedef basic_string<char_type> string_type;
 typedef locale locale_type;
 typedef ctype_base::mask char_class_type;

 static const char_class_type __regex_word = 0x80;
private:
 locale __loc_;
 const ctype<char_type>* __ct_;
 const collate<char_type>* __col_;

public:
 regex_traits();

 _LIBCPP_INLINE_VISIBILITY
 static size_t length(const char_type* __p)
 {return char_traits<char_type>::length(__p);}
 _LIBCPP_INLINE_VISIBILITY
 char_type translate(char_type __c) const {return __c;}
 char_type translate_nocase(char_type __c) const;
 template <class _ForwardIterator>
 string_type
 transform(_ForwardIterator __f, _ForwardIterator __l) const;
 template <class _ForwardIterator>
 _LIBCPP_INLINE_VISIBILITY
 string_type
 transform_primary( _ForwardIterator __f, _ForwardIterator __l) const
 {return __transform_primary(__f, __l, char_type());}
 template <class _ForwardIterator>
 _LIBCPP_INLINE_VISIBILITY
 string_type
 lookup_collatename(_ForwardIterator __f, _ForwardIterator __l) const
 {return __lookup_collatename(__f, __l, char_type());}
 template <class _ForwardIterator>
 _LIBCPP_INLINE_VISIBILITY
 char_class_type
 lookup_classname(_ForwardIterator __f, _ForwardIterator __l,
 bool __icase = false) const
 {return __lookup_classname(__f, __l, __icase, char_type());}
 bool isctype(char_type __c, char_class_type __m) const;
 _LIBCPP_INLINE_VISIBILITY
 int value(char_type __ch, int __radix) const
 {return __regex_traits_value(__ch, __radix);}
 locale_type imbue(locale_type __l);
 _LIBCPP_INLINE_VISIBILITY
 locale_type getloc()const {return __loc_;}

private:
 void __init();

 template <class _ForwardIterator>
 string_type
 __transform_primary(_ForwardIterator __f, _ForwardIterator __l, char) const;
 template <class _ForwardIterator>
 string_type
 __transform_primary(_ForwardIterator __f, _ForwardIterator __l, wchar_t) const;

 template <class _ForwardIterator>
 string_type
 __lookup_collatename(_ForwardIterator __f, _ForwardIterator __l, char) const;
 template <class _ForwardIterator>
 string_type
 __lookup_collatename(_ForwardIterator __f, _ForwardIterator __l, wchar_t) const;

 template <class _ForwardIterator>
 char_class_type
 __lookup_classname(_ForwardIterator __f, _ForwardIterator __l,
 bool __icase, char) const;
 template <class _ForwardIterator>
 char_class_type
 __lookup_classname(_ForwardIterator __f, _ForwardIterator __l,
 bool __icase, wchar_t) const;

 static int __regex_traits_value(unsigned char __ch, int __radix);
 _LIBCPP_INLINE_VISIBILITY
 int __regex_traits_value(char __ch, int __radix) const
 {return __regex_traits_value(static_cast<unsigned char>(__ch), __radix);}
 int __regex_traits_value(wchar_t __ch, int __radix) const;
};

template <class _CharT>
const typename regex_traits<_CharT>::char_class_type
regex_traits<_CharT>::__regex_word;

template <class _CharT>
regex_traits<_CharT>::regex_traits()
{
 __init();
}

template <class _CharT>
typename regex_traits<_CharT>::char_type
regex_traits<_CharT>::translate_nocase(char_type __c) const
{
 return __ct_->tolower(__c);
}

template <class _CharT>
template <class _ForwardIterator>
typename regex_traits<_CharT>::string_type
regex_traits<_CharT>::transform(_ForwardIterator __f, _ForwardIterator __l) const
{
 string_type __s(__f, __l);
 return __col_->transform(__s.data(), __s.data() + __s.size());
}

template <class _CharT>
void
regex_traits<_CharT>::__init()
{
 __ct_ = &use_facet<ctype<char_type> >(__loc_);
 __col_ = &use_facet<collate<char_type> >(__loc_);
}

template <class _CharT>
typename regex_traits<_CharT>::locale_type
regex_traits<_CharT>::imbue(locale_type __l)
{
 locale __r = __loc_;
 __loc_ = __l;
 __init();
 return __r;
}

// transform_primary is very FreeBSD-specific

template <class _CharT>
template <class _ForwardIterator>
typename regex_traits<_CharT>::string_type
regex_traits<_CharT>::__transform_primary(_ForwardIterator __f,
 _ForwardIterator __l, char) const
{
 const string_type __s(__f, __l);
 string_type __d = __col_->transform(__s.data(), __s.data() + __s.size());
 switch (__d.size())
 {
 case 1:
 break;
 case 12:
 __d[11] = __d[3];
 break;
 default:
 __d.clear();
 break;
 }
 return __d;
}

template <class _CharT>
template <class _ForwardIterator>
typename regex_traits<_CharT>::string_type
regex_traits<_CharT>::__transform_primary(_ForwardIterator __f,
 _ForwardIterator __l, wchar_t) const
{
 const string_type __s(__f, __l);
 string_type __d = __col_->transform(__s.data(), __s.data() + __s.size());
 switch (__d.size())
 {
 case 1:
 break;
 case 3:
 __d[2] = __d[0];
 break;
 default:
 __d.clear();
 break;
 }
 return __d;
}

// lookup_collatename is very FreeBSD-specific

_LIBCPP_FUNC_VIS string __get_collation_name(const char* __s);

template <class _CharT>
template <class _ForwardIterator>
typename regex_traits<_CharT>::string_type
regex_traits<_CharT>::__lookup_collatename(_ForwardIterator __f,
 _ForwardIterator __l, char) const
{
 string_type __s(__f, __l);
 string_type __r;
 if (!__s.empty())
 {
 __r = __get_collation_name(__s.c_str());
 if (__r.empty() && __s.size() <= 2)
 {
 __r = __col_->transform(__s.data(), __s.data() + __s.size());
 if (__r.size() == 1 || __r.size() == 12)
 __r = __s;
 else
 __r.clear();
 }
 }
 return __r;
}

template <class _CharT>
template <class _ForwardIterator>
typename regex_traits<_CharT>::string_type
regex_traits<_CharT>::__lookup_collatename(_ForwardIterator __f,
 _ForwardIterator __l, wchar_t) const
{
 string_type __s(__f, __l);
 string __n;
 __n.reserve(__s.size());
 for (typename string_type::const_iterator __i = __s.begin(), __e = __s.end();
 __i != __e; ++__i)
 {
 if (static_cast<unsigned>(*__i) >= 127)
 return string_type();
 __n.push_back(char(*__i));
 }
 string_type __r;
 if (!__s.empty())
 {
 __n = __get_collation_name(__n.c_str());
 if (!__n.empty())
 __r.assign(__n.begin(), __n.end());
 else if (__s.size() <= 2)
 {
 __r = __col_->transform(__s.data(), __s.data() + __s.size());
 if (__r.size() == 1 || __r.size() == 3)
 __r = __s;
 else
 __r.clear();
 }
 }
 return __r;
}

// lookup_classname

regex_traits<char>::char_class_type _LIBCPP_FUNC_VIS
__get_classname(const char* __s, bool __icase);

template <class _CharT>
template <class _ForwardIterator>
typename regex_traits<_CharT>::char_class_type
regex_traits<_CharT>::__lookup_classname(_ForwardIterator __f,
 _ForwardIterator __l,
 bool __icase, char) const
{
 string_type __s(__f, __l);
 __ct_->tolower(&__s[0], &__s[0] + __s.size());
 return __get_classname(__s.c_str(), __icase);
}

template <class _CharT>
template <class _ForwardIterator>
typename regex_traits<_CharT>::char_class_type
regex_traits<_CharT>::__lookup_classname(_ForwardIterator __f,
 _ForwardIterator __l,
 bool __icase, wchar_t) const
{
 string_type __s(__f, __l);
 __ct_->tolower(&__s[0], &__s[0] + __s.size());
 string __n;
 __n.reserve(__s.size());
 for (typename string_type::const_iterator __i = __s.begin(), __e = __s.end();
 __i != __e; ++__i)
 {
 if (static_cast<unsigned>(*__i) >= 127)
 return char_class_type();
 __n.push_back(char(*__i));
 }
 return __get_classname(__n.c_str(), __icase);
}

template <class _CharT>
bool
regex_traits<_CharT>::isctype(char_type __c, char_class_type __m) const
{
 if (__ct_->is(__m, __c))
 return true;
 return (__c == '_' && (__m & __regex_word));
}

template <class _CharT>
int
regex_traits<_CharT>::__regex_traits_value(unsigned char __ch, int __radix)
{
 if ((__ch & 0xF8u) == 0x30) // '0' <= __ch && __ch <= '7'
 return __ch - '0';
 if (__radix != 8)
 {
 if ((__ch & 0xFEu) == 0x38) // '8' <= __ch && __ch <= '9'
 return __ch - '0';
 if (__radix == 16)
 {
 __ch |= 0x20; // tolower
 if ('a' <= __ch && __ch <= 'f')
 return __ch - ('a' - 10);
 }
 }
 return -1;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
int
regex_traits<_CharT>::__regex_traits_value(wchar_t __ch, int __radix) const
{
 return __regex_traits_value(static_cast<unsigned char>(__ct_->narrow(__ch, char_type())), __radix);
}

template <class _CharT> class __node;

template <class _BidirectionalIterator> class _LIBCPP_TYPE_VIS_ONLY sub_match;

template <class _BidirectionalIterator,
 class _Allocator = allocator<sub_match<_BidirectionalIterator> > >
class _LIBCPP_TYPE_VIS_ONLY match_results;

template <class _CharT>
struct __state
{
 enum
 {
 __end_state = -1000,
 __consume_input, // -999
 __begin_marked_expr, // -998
 __end_marked_expr, // -997
 __pop_state, // -996
 __accept_and_consume, // -995
 __accept_but_not_consume, // -994
 __reject, // -993
 __split,
 __repeat
 };

 int __do_;
 const _CharT* __first_;
 const _CharT* __current_;
 const _CharT* __last_;
 vector<sub_match<const _CharT*> > __sub_matches_;
 vector<pair<size_t, const _CharT*> > __loop_data_;
 const __node<_CharT>* __node_;
 regex_constants::match_flag_type __flags_;
 bool __at_first_;

 _LIBCPP_INLINE_VISIBILITY
 __state()
 : __do_(0), __first_(nullptr), __current_(nullptr), __last_(nullptr),
 __node_(nullptr), __flags_() {}
};

// __node

template <class _CharT>
class __node
{
 __node(const __node&);
 __node& operator=(const __node&);
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __node() {}
 _LIBCPP_INLINE_VISIBILITY
 virtual ~__node() {}

 _LIBCPP_INLINE_VISIBILITY
 virtual void __exec(__state&) const {};
 _LIBCPP_INLINE_VISIBILITY
 virtual void __exec_split(bool, __state&) const {};
};

// __end_state

template <class _CharT>
class __end_state
 : public __node<_CharT>
{
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __end_state() {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__end_state<_CharT>::__exec(__state& __s) const
{
 __s.__do_ = __state::__end_state;
}

// __has_one_state

template <class _CharT>
class __has_one_state
 : public __node<_CharT>
{
 __node<_CharT>* __first_;

public:
 _LIBCPP_INLINE_VISIBILITY
 explicit __has_one_state(__node<_CharT>* __s)
 : __first_(__s) {}

 _LIBCPP_INLINE_VISIBILITY
 __node<_CharT>* first() const {return __first_;}
 _LIBCPP_INLINE_VISIBILITY
 __node<_CharT>*& first() {return __first_;}
};

// __owns_one_state

template <class _CharT>
class __owns_one_state
 : public __has_one_state<_CharT>
{
 typedef __has_one_state<_CharT> base;

public:
 _LIBCPP_INLINE_VISIBILITY
 explicit __owns_one_state(__node<_CharT>* __s)
 : base(__s) {}

 virtual ~__owns_one_state();
};

template <class _CharT>
__owns_one_state<_CharT>::~__owns_one_state()
{
 delete this->first();
}

// __empty_state

template <class _CharT>
class __empty_state
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __empty_state(__node<_CharT>* __s)
 : base(__s) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__empty_state<_CharT>::__exec(__state& __s) const
{
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
}

// __empty_non_own_state

template <class _CharT>
class __empty_non_own_state
 : public __has_one_state<_CharT>
{
 typedef __has_one_state<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __empty_non_own_state(__node<_CharT>* __s)
 : base(__s) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__empty_non_own_state<_CharT>::__exec(__state& __s) const
{
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
}

// __repeat_one_loop

template <class _CharT>
class __repeat_one_loop
 : public __has_one_state<_CharT>
{
 typedef __has_one_state<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __repeat_one_loop(__node<_CharT>* __s)
 : base(__s) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__repeat_one_loop<_CharT>::__exec(__state& __s) const
{
 __s.__do_ = __state::__repeat;
 __s.__node_ = this->first();
}

// __owns_two_states

template <class _CharT>
class __owns_two_states
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 base* __second_;

public:
 _LIBCPP_INLINE_VISIBILITY
 explicit __owns_two_states(__node<_CharT>* __s1, base* __s2)
 : base(__s1), __second_(__s2) {}

 virtual ~__owns_two_states();

 _LIBCPP_INLINE_VISIBILITY
 base* second() const {return __second_;}
 _LIBCPP_INLINE_VISIBILITY
 base*& second() {return __second_;}
};

template <class _CharT>
__owns_two_states<_CharT>::~__owns_two_states()
{
 delete __second_;
}

// __loop

template <class _CharT>
class __loop
 : public __owns_two_states<_CharT>
{
 typedef __owns_two_states<_CharT> base;

 size_t __min_;
 size_t __max_;
 unsigned __loop_id_;
 unsigned __mexp_begin_;
 unsigned __mexp_end_;
 bool __greedy_;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __loop(unsigned __loop_id,
 __node<_CharT>* __s1, __owns_one_state<_CharT>* __s2,
 unsigned __mexp_begin, unsigned __mexp_end,
 bool __greedy = true,
 size_t __min = 0,
 size_t __max = numeric_limits<size_t>::max())
 : base(__s1, __s2), __min_(__min), __max_(__max), __loop_id_(__loop_id),
 __mexp_begin_(__mexp_begin), __mexp_end_(__mexp_end),
 __greedy_(__greedy) {}

 virtual void __exec(__state& __s) const;
 virtual void __exec_split(bool __second, __state& __s) const;

private:
 _LIBCPP_INLINE_VISIBILITY
 void __init_repeat(__state& __s) const
 {
 __s.__loop_data_[__loop_id_].second = __s.__current_;
 for (size_t __i = __mexp_begin_-1; __i != __mexp_end_-1; ++__i)
 {
 __s.__sub_matches_[__i].first = __s.__last_;
 __s.__sub_matches_[__i].second = __s.__last_;
 __s.__sub_matches_[__i].matched = false;
 }
 }
};

template <class _CharT>
void
__loop<_CharT>::__exec(__state& __s) const
{
 if (__s.__do_ == __state::__repeat)
 {
 bool __do_repeat = ++__s.__loop_data_[__loop_id_].first < __max_;
 bool __do_alt = __s.__loop_data_[__loop_id_].first >= __min_;
 if (__do_repeat && __do_alt &&
 __s.__loop_data_[__loop_id_].second == __s.__current_)
 __do_repeat = false;
 if (__do_repeat && __do_alt)
 __s.__do_ = __state::__split;
 else if (__do_repeat)
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
 __init_repeat(__s);
 }
 else
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->second();
 }
 }
 else
 {
 __s.__loop_data_[__loop_id_].first = 0;
 bool __do_repeat = 0 < __max_;
 bool __do_alt = 0 >= __min_;
 if (__do_repeat && __do_alt)
 __s.__do_ = __state::__split;
 else if (__do_repeat)
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
 __init_repeat(__s);
 }
 else
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->second();
 }
 }
}

template <class _CharT>
void
__loop<_CharT>::__exec_split(bool __second, __state& __s) const
{
 __s.__do_ = __state::__accept_but_not_consume;
 if (__greedy_ != __second)
 {
 __s.__node_ = this->first();
 __init_repeat(__s);
 }
 else
 __s.__node_ = this->second();
}

// __alternate

template <class _CharT>
class __alternate
 : public __owns_two_states<_CharT>
{
 typedef __owns_two_states<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __alternate(__owns_one_state<_CharT>* __s1,
 __owns_one_state<_CharT>* __s2)
 : base(__s1, __s2) {}

 virtual void __exec(__state& __s) const;
 virtual void __exec_split(bool __second, __state& __s) const;
};

template <class _CharT>
void
__alternate<_CharT>::__exec(__state& __s) const
{
 __s.__do_ = __state::__split;
}

template <class _CharT>
void
__alternate<_CharT>::__exec_split(bool __second, __state& __s) const
{
 __s.__do_ = __state::__accept_but_not_consume;
 if (__second)
 __s.__node_ = this->second();
 else
 __s.__node_ = this->first();
}

// __begin_marked_subexpression

template <class _CharT>
class __begin_marked_subexpression
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 unsigned __mexp_;
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __begin_marked_subexpression(unsigned __mexp, __node<_CharT>* __s)
 : base(__s), __mexp_(__mexp) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__begin_marked_subexpression<_CharT>::__exec(__state& __s) const
{
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__sub_matches_[__mexp_-1].first = __s.__current_;
 __s.__node_ = this->first();
}

// __end_marked_subexpression

template <class _CharT>
class __end_marked_subexpression
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 unsigned __mexp_;
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __end_marked_subexpression(unsigned __mexp, __node<_CharT>* __s)
 : base(__s), __mexp_(__mexp) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__end_marked_subexpression<_CharT>::__exec(__state& __s) const
{
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__sub_matches_[__mexp_-1].second = __s.__current_;
 __s.__sub_matches_[__mexp_-1].matched = true;
 __s.__node_ = this->first();
}

// __back_ref

template <class _CharT>
class __back_ref
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 unsigned __mexp_;
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __back_ref(unsigned __mexp, __node<_CharT>* __s)
 : base(__s), __mexp_(__mexp) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__back_ref<_CharT>::__exec(__state& __s) const
{
 sub_match<const _CharT*>& __sm = __s.__sub_matches_[__mexp_-1];
 if (__sm.matched)
 {
 ptrdiff_t __len = __sm.second - __sm.first;
 if (__s.__last_ - __s.__current_ >= __len &&
 _VSTD::equal(__sm.first, __sm.second, __s.__current_))
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__current_ += __len;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __back_ref_icase

template <class _CharT, class _Traits>
class __back_ref_icase
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 _Traits __traits_;
 unsigned __mexp_;
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __back_ref_icase(const _Traits& __traits, unsigned __mexp,
 __node<_CharT>* __s)
 : base(__s), __traits_(__traits), __mexp_(__mexp) {}

 virtual void __exec(__state&) const;
};

template <class _CharT, class _Traits>
void
__back_ref_icase<_CharT, _Traits>::__exec(__state& __s) const
{
 sub_match<const _CharT*>& __sm = __s.__sub_matches_[__mexp_-1];
 if (__sm.matched)
 {
 ptrdiff_t __len = __sm.second - __sm.first;
 if (__s.__last_ - __s.__current_ >= __len)
 {
 for (ptrdiff_t __i = 0; __i < __len; ++__i)
 {
 if (__traits_.translate_nocase(__sm.first[__i]) !=
 __traits_.translate_nocase(__s.__current_[__i]))
 goto __not_equal;
 }
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__current_ += __len;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
 }
 else
 {
__not_equal:
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __back_ref_collate

template <class _CharT, class _Traits>
class __back_ref_collate
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 _Traits __traits_;
 unsigned __mexp_;
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __back_ref_collate(const _Traits& __traits, unsigned __mexp,
 __node<_CharT>* __s)
 : base(__s), __traits_(__traits), __mexp_(__mexp) {}

 virtual void __exec(__state&) const;
};

template <class _CharT, class _Traits>
void
__back_ref_collate<_CharT, _Traits>::__exec(__state& __s) const
{
 sub_match<const _CharT*>& __sm = __s.__sub_matches_[__mexp_-1];
 if (__sm.matched)
 {
 ptrdiff_t __len = __sm.second - __sm.first;
 if (__s.__last_ - __s.__current_ >= __len)
 {
 for (ptrdiff_t __i = 0; __i < __len; ++__i)
 {
 if (__traits_.translate(__sm.first[__i]) !=
 __traits_.translate(__s.__current_[__i]))
 goto __not_equal;
 }
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__current_ += __len;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
 }
 else
 {
__not_equal:
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __word_boundary

template <class _CharT, class _Traits>
class __word_boundary
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 _Traits __traits_;
 bool __invert_;
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 explicit __word_boundary(const _Traits& __traits, bool __invert,
 __node<_CharT>* __s)
 : base(__s), __traits_(__traits), __invert_(__invert) {}

 virtual void __exec(__state&) const;
};

template <class _CharT, class _Traits>
void
__word_boundary<_CharT, _Traits>::__exec(__state& __s) const
{
 bool __is_word_b = false;
 if (__s.__first_ != __s.__last_)
 {
 if (__s.__current_ == __s.__last_)
 {
 if (!(__s.__flags_ & regex_constants::match_not_eow))
 {
 _CharT __c = __s.__current_[-1];
 __is_word_b = __c == '_' ||
 __traits_.isctype(__c, ctype_base::alnum);
 }
 }
 else if (__s.__current_ == __s.__first_ &&
 !(__s.__flags_ & regex_constants::match_prev_avail))
 {
 if (!(__s.__flags_ & regex_constants::match_not_bow))
 {
 _CharT __c = *__s.__current_;
 __is_word_b = __c == '_' ||
 __traits_.isctype(__c, ctype_base::alnum);
 }
 }
 else
 {
 _CharT __c1 = __s.__current_[-1];
 _CharT __c2 = *__s.__current_;
 bool __is_c1_b = __c1 == '_' ||
 __traits_.isctype(__c1, ctype_base::alnum);
 bool __is_c2_b = __c2 == '_' ||
 __traits_.isctype(__c2, ctype_base::alnum);
 __is_word_b = __is_c1_b != __is_c2_b;
 }
 }
 if (__is_word_b != __invert_)
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __l_anchor

template <class _CharT>
class __l_anchor
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __l_anchor(__node<_CharT>* __s)
 : base(__s) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__l_anchor<_CharT>::__exec(__state& __s) const
{
 if (__s.__at_first_ && __s.__current_ == __s.__first_)
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __r_anchor

template <class _CharT>
class __r_anchor
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __r_anchor(__node<_CharT>* __s)
 : base(__s) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__r_anchor<_CharT>::__exec(__state& __s) const
{
 if (__s.__current_ == __s.__last_)
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __match_any

template <class _CharT>
class __match_any
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __match_any(__node<_CharT>* __s)
 : base(__s) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__match_any<_CharT>::__exec(__state& __s) const
{
 if (__s.__current_ != __s.__last_ && *__s.__current_ != 0)
 {
 __s.__do_ = __state::__accept_and_consume;
 ++__s.__current_;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __match_any_but_newline

template <class _CharT>
class __match_any_but_newline
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __match_any_but_newline(__node<_CharT>* __s)
 : base(__s) {}

 virtual void __exec(__state&) const;
};

template <> _LIBCPP_FUNC_VIS void __match_any_but_newline<char>::__exec(__state&) const;
template <> _LIBCPP_FUNC_VIS void __match_any_but_newline<wchar_t>::__exec(__state&) const;

// __match_char

template <class _CharT>
class __match_char
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 _CharT __c_;

 __match_char(const __match_char&);
 __match_char& operator=(const __match_char&);
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __match_char(_CharT __c, __node<_CharT>* __s)
 : base(__s), __c_(__c) {}

 virtual void __exec(__state&) const;
};

template <class _CharT>
void
__match_char<_CharT>::__exec(__state& __s) const
{
 if (__s.__current_ != __s.__last_ && *__s.__current_ == __c_)
 {
 __s.__do_ = __state::__accept_and_consume;
 ++__s.__current_;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __match_char_icase

template <class _CharT, class _Traits>
class __match_char_icase
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 _Traits __traits_;
 _CharT __c_;

 __match_char_icase(const __match_char_icase&);
 __match_char_icase& operator=(const __match_char_icase&);
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __match_char_icase(const _Traits& __traits, _CharT __c, __node<_CharT>* __s)
 : base(__s), __traits_(__traits), __c_(__traits.translate_nocase(__c)) {}

 virtual void __exec(__state&) const;
};

template <class _CharT, class _Traits>
void
__match_char_icase<_CharT, _Traits>::__exec(__state& __s) const
{
 if (__s.__current_ != __s.__last_ &&
 __traits_.translate_nocase(*__s.__current_) == __c_)
 {
 __s.__do_ = __state::__accept_and_consume;
 ++__s.__current_;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __match_char_collate

template <class _CharT, class _Traits>
class __match_char_collate
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 _Traits __traits_;
 _CharT __c_;

 __match_char_collate(const __match_char_collate&);
 __match_char_collate& operator=(const __match_char_collate&);
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __match_char_collate(const _Traits& __traits, _CharT __c, __node<_CharT>* __s)
 : base(__s), __traits_(__traits), __c_(__traits.translate(__c)) {}

 virtual void __exec(__state&) const;
};

template <class _CharT, class _Traits>
void
__match_char_collate<_CharT, _Traits>::__exec(__state& __s) const
{
 if (__s.__current_ != __s.__last_ &&
 __traits_.translate(*__s.__current_) == __c_)
 {
 __s.__do_ = __state::__accept_and_consume;
 ++__s.__current_;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

// __bracket_expression

template <class _CharT, class _Traits>
class __bracket_expression
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;
 typedef typename _Traits::string_type string_type;

 _Traits __traits_;
 vector<_CharT> __chars_;
 vector<_CharT> __neg_chars_;
 vector<pair<string_type, string_type> > __ranges_;
 vector<pair<_CharT, _CharT> > __digraphs_;
 vector<string_type> __equivalences_;
 typename regex_traits<_CharT>::char_class_type __mask_;
 typename regex_traits<_CharT>::char_class_type __neg_mask_;
 bool __negate_;
 bool __icase_;
 bool __collate_;
 bool __might_have_digraph_;

 __bracket_expression(const __bracket_expression&);
 __bracket_expression& operator=(const __bracket_expression&);
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __bracket_expression(const _Traits& __traits, __node<_CharT>* __s,
 bool __negate, bool __icase, bool __collate)
 : base(__s), __traits_(__traits), __mask_(), __neg_mask_(),
 __negate_(__negate), __icase_(__icase), __collate_(__collate),
 __might_have_digraph_(__traits_.getloc().name() != "C") {}

 virtual void __exec(__state&) const;

 _LIBCPP_INLINE_VISIBILITY
 bool __negated() const {return __negate_;}

 _LIBCPP_INLINE_VISIBILITY
 void __add_char(_CharT __c)
 {
 if (__icase_)
 __chars_.push_back(__traits_.translate_nocase(__c));
 else if (__collate_)
 __chars_.push_back(__traits_.translate(__c));
 else
 __chars_.push_back(__c);
 }
 _LIBCPP_INLINE_VISIBILITY
 void __add_neg_char(_CharT __c)
 {
 if (__icase_)
 __neg_chars_.push_back(__traits_.translate_nocase(__c));
 else if (__collate_)
 __neg_chars_.push_back(__traits_.translate(__c));
 else
 __neg_chars_.push_back(__c);
 }
 _LIBCPP_INLINE_VISIBILITY
 void __add_range(string_type __b, string_type __e)
 {
 if (__collate_)
 {
 if (__icase_)
 {
 for (size_t __i = 0; __i < __b.size(); ++__i)
 __b[__i] = __traits_.translate_nocase(__b[__i]);
 for (size_t __i = 0; __i < __e.size(); ++__i)
 __e[__i] = __traits_.translate_nocase(__e[__i]);
 }
 else
 {
 for (size_t __i = 0; __i < __b.size(); ++__i)
 __b[__i] = __traits_.translate(__b[__i]);
 for (size_t __i = 0; __i < __e.size(); ++__i)
 __e[__i] = __traits_.translate(__e[__i]);
 }
 __ranges_.push_back(make_pair(
 __traits_.transform(__b.begin(), __b.end()),
 __traits_.transform(__e.begin(), __e.end())));
 }
 else
 {
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__b.size() != 1 || __e.size() != 1)
 throw regex_error(regex_constants::error_collate);
#endif // _LIBCPP_NO_EXCEPTIONS
 if (__icase_)
 {
 __b[0] = __traits_.translate_nocase(__b[0]);
 __e[0] = __traits_.translate_nocase(__e[0]);
 }
 __ranges_.push_back(make_pair(_VSTD::move(__b), _VSTD::move(__e)));
 }
 }
 _LIBCPP_INLINE_VISIBILITY
 void __add_digraph(_CharT __c1, _CharT __c2)
 {
 if (__icase_)
 __digraphs_.push_back(make_pair(__traits_.translate_nocase(__c1),
 __traits_.translate_nocase(__c2)));
 else if (__collate_)
 __digraphs_.push_back(make_pair(__traits_.translate(__c1),
 __traits_.translate(__c2)));
 else
 __digraphs_.push_back(make_pair(__c1, __c2));
 }
 _LIBCPP_INLINE_VISIBILITY
 void __add_equivalence(const string_type& __s)
 {__equivalences_.push_back(__s);}
 _LIBCPP_INLINE_VISIBILITY
 void __add_class(typename regex_traits<_CharT>::char_class_type __mask)
 {__mask_ |= __mask;}
 _LIBCPP_INLINE_VISIBILITY
 void __add_neg_class(typename regex_traits<_CharT>::char_class_type __mask)
 {__neg_mask_ |= __mask;}
};

template <class _CharT, class _Traits>
void
__bracket_expression<_CharT, _Traits>::__exec(__state& __s) const
{
 bool __found = false;
 unsigned __consumed = 0;
 if (__s.__current_ != __s.__last_)
 {
 ++__consumed;
 if (__might_have_digraph_)
 {
 const _CharT* __next = _VSTD::next(__s.__current_);
 if (__next != __s.__last_)
 {
 pair<_CharT, _CharT> __ch2(*__s.__current_, *__next);
 if (__icase_)
 {
 __ch2.first = __traits_.translate_nocase(__ch2.first);
 __ch2.second = __traits_.translate_nocase(__ch2.second);
 }
 else if (__collate_)
 {
 __ch2.first = __traits_.translate(__ch2.first);
 __ch2.second = __traits_.translate(__ch2.second);
 }
 if (!__traits_.lookup_collatename(&__ch2.first, &__ch2.first+2).empty())
 {
 // __ch2 is a digraph in this locale
 ++__consumed;
 for (size_t __i = 0; __i < __digraphs_.size(); ++__i)
 {
 if (__ch2 == __digraphs_[__i])
 {
 __found = true;
 goto __exit;
 }
 }
 if (__collate_ && !__ranges_.empty())
 {
 string_type __s2 = __traits_.transform(&__ch2.first,
 &__ch2.first + 2);
 for (size_t __i = 0; __i < __ranges_.size(); ++__i)
 {
 if (__ranges_[__i].first <= __s2 &&
 __s2 <= __ranges_[__i].second)
 {
 __found = true;
 goto __exit;
 }
 }
 }
 if (!__equivalences_.empty())
 {
 string_type __s2 = __traits_.transform_primary(&__ch2.first,
 &__ch2.first + 2);
 for (size_t __i = 0; __i < __equivalences_.size(); ++__i)
 {
 if (__s2 == __equivalences_[__i])
 {
 __found = true;
 goto __exit;
 }
 }
 }
 if (__traits_.isctype(__ch2.first, __mask_) &&
 __traits_.isctype(__ch2.second, __mask_))
 {
 __found = true;
 goto __exit;
 }
 if (!__traits_.isctype(__ch2.first, __neg_mask_) &&
 !__traits_.isctype(__ch2.second, __neg_mask_))
 {
 __found = true;
 goto __exit;
 }
 goto __exit;
 }
 }
 }
 // test *__s.__current_ as not a digraph
 _CharT __ch = *__s.__current_;
 if (__icase_)
 __ch = __traits_.translate_nocase(__ch);
 else if (__collate_)
 __ch = __traits_.translate(__ch);
 for (size_t __i = 0; __i < __chars_.size(); ++__i)
 {
 if (__ch == __chars_[__i])
 {
 __found = true;
 goto __exit;
 }
 }
 if (!__neg_chars_.empty())
 {
 for (size_t __i = 0; __i < __neg_chars_.size(); ++__i)
 {
 if (__ch == __neg_chars_[__i])
 goto __is_neg_char;
 }
 __found = true;
 goto __exit;
 }
__is_neg_char:
 if (!__ranges_.empty())
 {
 string_type __s2 = __collate_ ?
 __traits_.transform(&__ch, &__ch + 1) :
 string_type(1, __ch);
 for (size_t __i = 0; __i < __ranges_.size(); ++__i)
 {
 if (__ranges_[__i].first <= __s2 && __s2 <= __ranges_[__i].second)
 {
 __found = true;
 goto __exit;
 }
 }
 }
 if (!__equivalences_.empty())
 {
 string_type __s2 = __traits_.transform_primary(&__ch, &__ch + 1);
 for (size_t __i = 0; __i < __equivalences_.size(); ++__i)
 {
 if (__s2 == __equivalences_[__i])
 {
 __found = true;
 goto __exit;
 }
 }
 }
 if (__traits_.isctype(__ch, __mask_))
 {
 __found = true;
 goto __exit;
 }
 if (__neg_mask_ && !__traits_.isctype(__ch, __neg_mask_))
 {
 __found = true;
 goto __exit;
 }
 }
 else
 __found = __negate_; // force reject
__exit:
 if (__found != __negate_)
 {
 __s.__do_ = __state::__accept_and_consume;
 __s.__current_ += __consumed;
 __s.__node_ = this->first();
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

template <class _CharT, class _Traits> class __lookahead;

template <class _CharT, class _Traits = regex_traits<_CharT> >
class _LIBCPP_TYPE_VIS_ONLY basic_regex
{
public:
 // types:
 typedef _CharT value_type;
 typedef regex_constants::syntax_option_type flag_type;
 typedef typename _Traits::locale_type locale_type;

private:
 _Traits __traits_;
 flag_type __flags_;
 unsigned __marked_count_;
 unsigned __loop_count_;
 int __open_count_;
 shared_ptr<__empty_state<_CharT> > __start_;
 __owns_one_state<_CharT>* __end_;

 typedef _VSTD::__state<_CharT> __state;
 typedef _VSTD::__node<_CharT> __node;

public:
 // constants:
 static const regex_constants::syntax_option_type icase = regex_constants::icase;
 static const regex_constants::syntax_option_type nosubs = regex_constants::nosubs;
 static const regex_constants::syntax_option_type optimize = regex_constants::optimize;
 static const regex_constants::syntax_option_type collate = regex_constants::collate;
 static const regex_constants::syntax_option_type ECMAScript = regex_constants::ECMAScript;
 static const regex_constants::syntax_option_type basic = regex_constants::basic;
 static const regex_constants::syntax_option_type extended = regex_constants::extended;
 static const regex_constants::syntax_option_type awk = regex_constants::awk;
 static const regex_constants::syntax_option_type grep = regex_constants::grep;
 static const regex_constants::syntax_option_type egrep = regex_constants::egrep;

 // construct/copy/destroy:
 _LIBCPP_INLINE_VISIBILITY
 basic_regex()
 : __flags_(), __marked_count_(0), __loop_count_(0), __open_count_(0),
 __end_(0)
 {}
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_regex(const value_type* __p, flag_type __f = regex_constants::ECMAScript)
 : __flags_(__f), __marked_count_(0), __loop_count_(0), __open_count_(0),
 __end_(0)
 {__parse(__p, __p + __traits_.length(__p));}
 _LIBCPP_INLINE_VISIBILITY
 basic_regex(const value_type* __p, size_t __len, flag_type __f)
 : __flags_(__f), __marked_count_(0), __loop_count_(0), __open_count_(0),
 __end_(0)
 {__parse(__p, __p + __len);}
// basic_regex(const basic_regex&) = default;
// basic_regex(basic_regex&&) = default;
 template <class _ST, class _SA>
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_regex(const basic_string<value_type, _ST, _SA>& __p,
 flag_type __f = regex_constants::ECMAScript)
 : __flags_(__f), __marked_count_(0), __loop_count_(0), __open_count_(0),
 __end_(0)
 {__parse(__p.begin(), __p.end());}
 template <class _ForwardIterator>
 _LIBCPP_INLINE_VISIBILITY
 basic_regex(_ForwardIterator __first, _ForwardIterator __last,
 flag_type __f = regex_constants::ECMAScript)
 : __flags_(__f), __marked_count_(0), __loop_count_(0), __open_count_(0),
 __end_(0)
 {__parse(__first, __last);}
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 basic_regex(initializer_list<value_type> __il,
 flag_type __f = regex_constants::ECMAScript)
 : __flags_(__f), __marked_count_(0), __loop_count_(0), __open_count_(0),
 __end_(0)
 {__parse(__il.begin(), __il.end());}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

// ~basic_regex() = default;

// basic_regex& operator=(const basic_regex&) = default;
// basic_regex& operator=(basic_regex&&) = default;
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& operator=(const value_type* __p)
 {return assign(__p);}
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& operator=(initializer_list<value_type> __il)
 {return assign(__il);}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 template <class _ST, class _SA>
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& operator=(const basic_string<value_type, _ST, _SA>& __p)
 {return assign(__p);}

 // assign:
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& assign(const basic_regex& __that)
 {return *this = __that;}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& assign(basic_regex&& __that) _NOEXCEPT
 {return *this = _VSTD::move(__that);}
#endif
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& assign(const value_type* __p, flag_type __f = regex_constants::ECMAScript)
 {return assign(__p, __p + __traits_.length(__p), __f);}
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& assign(const value_type* __p, size_t __len, flag_type __f)
 {return assign(__p, __p + __len, __f);}
 template <class _ST, class _SA>
 _LIBCPP_INLINE_VISIBILITY
 basic_regex& assign(const basic_string<value_type, _ST, _SA>& __s,
 flag_type __f = regex_constants::ECMAScript)
 {return assign(__s.begin(), __s.end(), __f);}

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if
 <
 __is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value,
 basic_regex&
 >::type
 assign(_InputIterator __first, _InputIterator __last,
 flag_type __f = regex_constants::ECMAScript)
 {
 basic_string<_CharT> __t(__first, __last);
 return assign(__t.begin(), __t.end(), __f);
 }

private:
 _LIBCPP_INLINE_VISIBILITY
 void __member_init(flag_type __f)
 {
 __flags_ = __f;
 __marked_count_ = 0;
 __loop_count_ = 0;
 __open_count_ = 0;
 __end_ = nullptr;
 }
public:

 template <class _ForwardIterator>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if
 <
 __is_forward_iterator<_ForwardIterator>::value,
 basic_regex&
 >::type
 assign(_ForwardIterator __first, _ForwardIterator __last,
 flag_type __f = regex_constants::ECMAScript)
 {
 __member_init(__f);
 __parse(__first, __last);
 return *this;
 }

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 _LIBCPP_INLINE_VISIBILITY
 basic_regex& assign(initializer_list<value_type> __il,
 flag_type __f = regex_constants::ECMAScript)
 {return assign(__il.begin(), __il.end(), __f);}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 // const operations:
 _LIBCPP_INLINE_VISIBILITY
 unsigned mark_count() const {return __marked_count_;}
 _LIBCPP_INLINE_VISIBILITY
 flag_type flags() const {return __flags_;}

 // locale:
 _LIBCPP_INLINE_VISIBILITY
 locale_type imbue(locale_type __loc)
 {
 __member_init(ECMAScript);
 __start_.reset();
 return __traits_.imbue(__loc);
 }
 _LIBCPP_INLINE_VISIBILITY
 locale_type getloc() const {return __traits_.getloc();}

 // swap:
 void swap(basic_regex& __r);

private:
 _LIBCPP_INLINE_VISIBILITY
 unsigned __loop_count() const {return __loop_count_;}

 template <class _ForwardIterator>
 _ForwardIterator
 __parse(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_basic_reg_exp(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_RE_expression(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_simple_RE(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_nondupl_RE(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_one_char_or_coll_elem_RE(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_Back_open_paren(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_Back_close_paren(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_Back_open_brace(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_Back_close_brace(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_BACKREF(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_ORD_CHAR(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_QUOTED_CHAR(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_RE_dupl_symbol(_ForwardIterator __first, _ForwardIterator __last,
 __owns_one_state<_CharT>* __s,
 unsigned __mexp_begin, unsigned __mexp_end);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_ERE_dupl_symbol(_ForwardIterator __first, _ForwardIterator __last,
 __owns_one_state<_CharT>* __s,
 unsigned __mexp_begin, unsigned __mexp_end);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_bracket_expression(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_follow_list(_ForwardIterator __first, _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_expression_term(_ForwardIterator __first, _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_equivalence_class(_ForwardIterator __first, _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_character_class(_ForwardIterator __first, _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_collating_symbol(_ForwardIterator __first, _ForwardIterator __last,
 basic_string<_CharT>& __col_sym);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_DUP_COUNT(_ForwardIterator __first, _ForwardIterator __last, int& __c);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_extended_reg_exp(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_ERE_branch(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_ERE_expression(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_one_char_or_coll_elem_ERE(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_ORD_CHAR_ERE(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_QUOTED_CHAR_ERE(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_ecma_exp(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_alternative(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_term(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_assertion(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_atom(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_atom_escape(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_decimal_escape(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_character_class_escape(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_character_escape(_ForwardIterator __first, _ForwardIterator __last,
 basic_string<_CharT>* __str = nullptr);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_pattern_character(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_grep(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_egrep(_ForwardIterator __first, _ForwardIterator __last);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_class_escape(_ForwardIterator __first, _ForwardIterator __last,
 basic_string<_CharT>& __str,
 __bracket_expression<_CharT, _Traits>* __ml);
 template <class _ForwardIterator>
 _ForwardIterator
 __parse_awk_escape(_ForwardIterator __first, _ForwardIterator __last,
 basic_string<_CharT>* __str = nullptr);

 _LIBCPP_INLINE_VISIBILITY
 void __push_l_anchor();
 void __push_r_anchor();
 void __push_match_any();
 void __push_match_any_but_newline();
 _LIBCPP_INLINE_VISIBILITY
 void __push_greedy_inf_repeat(size_t __min, __owns_one_state<_CharT>* __s,
 unsigned __mexp_begin = 0, unsigned __mexp_end = 0)
 {__push_loop(__min, numeric_limits<size_t>::max(), __s,
 __mexp_begin, __mexp_end);}
 _LIBCPP_INLINE_VISIBILITY
 void __push_nongreedy_inf_repeat(size_t __min, __owns_one_state<_CharT>* __s,
 unsigned __mexp_begin = 0, unsigned __mexp_end = 0)
 {__push_loop(__min, numeric_limits<size_t>::max(), __s,
 __mexp_begin, __mexp_end, false);}
 void __push_loop(size_t __min, size_t __max, __owns_one_state<_CharT>* __s,
 size_t __mexp_begin = 0, size_t __mexp_end = 0,
 bool __greedy = true);
 __bracket_expression<_CharT, _Traits>* __start_matching_list(bool __negate);
 void __push_char(value_type __c);
 void __push_back_ref(int __i);
 void __push_alternation(__owns_one_state<_CharT>* __sa,
 __owns_one_state<_CharT>* __sb);
 void __push_begin_marked_subexpression();
 void __push_end_marked_subexpression(unsigned);
 void __push_empty();
 void __push_word_boundary(bool);
 void __push_lookahead(const basic_regex&, bool, unsigned);

 template <class _Allocator>
 bool
 __search(const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags) const;

 template <class _Allocator>
 bool
 __match_at_start(const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool) const;
 template <class _Allocator>
 bool
 __match_at_start_ecma(const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool) const;
 template <class _Allocator>
 bool
 __match_at_start_posix_nosubs(const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool) const;
 template <class _Allocator>
 bool
 __match_at_start_posix_subs(const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool) const;

 template <class _Bp, class _Ap, class _Cp, class _Tp>
 friend
 bool
 regex_search(_Bp, _Bp, match_results<_Bp, _Ap>&, const basic_regex<_Cp, _Tp>&,
 regex_constants::match_flag_type);

 template <class _Ap, class _Cp, class _Tp>
 friend
 bool
 regex_search(const _Cp*, const _Cp*, match_results<const _Cp*, _Ap>&,
 const basic_regex<_Cp, _Tp>&, regex_constants::match_flag_type);

 template <class _Bp, class _Cp, class _Tp>
 friend
 bool
 regex_search(_Bp, _Bp, const basic_regex<_Cp, _Tp>&,
 regex_constants::match_flag_type);

 template <class _Cp, class _Tp>
 friend
 bool
 regex_search(const _Cp*, const _Cp*,
 const basic_regex<_Cp, _Tp>&, regex_constants::match_flag_type);

 template <class _Cp, class _Ap, class _Tp>
 friend
 bool
 regex_search(const _Cp*, match_results<const _Cp*, _Ap>&, const basic_regex<_Cp, _Tp>&,
 regex_constants::match_flag_type);

 template <class _ST, class _SA, class _Cp, class _Tp>
 friend
 bool
 regex_search(const basic_string<_Cp, _ST, _SA>& __s,
 const basic_regex<_Cp, _Tp>& __e,
 regex_constants::match_flag_type __flags);

 template <class _ST, class _SA, class _Ap, class _Cp, class _Tp>
 friend
 bool
 regex_search(const basic_string<_Cp, _ST, _SA>& __s,
 match_results<typename basic_string<_Cp, _ST, _SA>::const_iterator, _Ap>&,
 const basic_regex<_Cp, _Tp>& __e,
 regex_constants::match_flag_type __flags);

 template <class _Iter, class _Ap, class _Cp, class _Tp>
 friend
 bool
 regex_search(__wrap_iter<_Iter> __first,
 __wrap_iter<_Iter> __last,
 match_results<__wrap_iter<_Iter>, _Ap>& __m,
 const basic_regex<_Cp, _Tp>& __e,
 regex_constants::match_flag_type __flags);

 template <class, class> friend class __lookahead;
};

template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::icase;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::nosubs;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::optimize;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::collate;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::ECMAScript;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::basic;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::extended;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::awk;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::grep;
template <class _CharT, class _Traits>
 const regex_constants::syntax_option_type basic_regex<_CharT, _Traits>::egrep;

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::swap(basic_regex& __r)
{
 using _VSTD::swap;
 swap(__traits_, __r.__traits_);
 swap(__flags_, __r.__flags_);
 swap(__marked_count_, __r.__marked_count_);
 swap(__loop_count_, __r.__loop_count_);
 swap(__open_count_, __r.__open_count_);
 swap(__start_, __r.__start_);
 swap(__end_, __r.__end_);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(basic_regex<_CharT, _Traits>& __x, basic_regex<_CharT, _Traits>& __y)
{
 return __x.swap(__y);
}

// __lookahead

template <class _CharT, class _Traits>
class __lookahead
 : public __owns_one_state<_CharT>
{
 typedef __owns_one_state<_CharT> base;

 basic_regex<_CharT, _Traits> __exp_;
 unsigned __mexp_;
 bool __invert_;

 __lookahead(const __lookahead&);
 __lookahead& operator=(const __lookahead&);
public:
 typedef _VSTD::__state<_CharT> __state;

 _LIBCPP_INLINE_VISIBILITY
 __lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
 : base(__s), __exp_(__exp), __invert_(__invert), __mexp_(__mexp) {}

 virtual void __exec(__state&) const;
};

template <class _CharT, class _Traits>
void
__lookahead<_CharT, _Traits>::__exec(__state& __s) const
{
 match_results<const _CharT*> __m;
 __m.__init(1 + __exp_.mark_count(), __s.__current_, __s.__last_);
 bool __matched = __exp_.__match_at_start_ecma(__s.__current_, __s.__last_,
 __m,
 __s.__flags_ | regex_constants::match_continuous,
 __s.__at_first_ && __s.__current_ == __s.__first_);
 if (__matched != __invert_)
 {
 __s.__do_ = __state::__accept_but_not_consume;
 __s.__node_ = this->first();
 for (unsigned __i = 1; __i < __m.size(); ++__i) {
 __s.__sub_matches_[__mexp_ + __i - 1] = __m.__matches_[__i];
 }
 }
 else
 {
 __s.__do_ = __state::__reject;
 __s.__node_ = nullptr;
 }
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse(_ForwardIterator __first,
 _ForwardIterator __last)
{
 {
 unique_ptr<__node> __h(new __end_state<_CharT>);
 __start_.reset(new __empty_state<_CharT>(__h.get()));
 __h.release();
 __end_ = __start_.get();
 }
 switch (__flags_ & 0x1F0)
 {
 case ECMAScript:
 __first = __parse_ecma_exp(__first, __last);
 break;
 case basic:
 __first = __parse_basic_reg_exp(__first, __last);
 break;
 case extended:
 case awk:
 __first = __parse_extended_reg_exp(__first, __last);
 break;
 case grep:
 __first = __parse_grep(__first, __last);
 break;
 case egrep:
 __first = __parse_egrep(__first, __last);
 break;
#ifndef _LIBCPP_NO_EXCEPTIONS
 default:
 throw regex_error(regex_constants::__re_err_grammar);
#endif // _LIBCPP_NO_EXCEPTIONS
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_basic_reg_exp(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 if (*__first == '^')
 {
 __push_l_anchor();
 ++__first;
 }
 if (__first != __last)
 {
 __first = __parse_RE_expression(__first, __last);
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp == __last && *__first == '$')
 {
 __push_r_anchor();
 ++__first;
 }
 }
 }
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first != __last)
 throw regex_error(regex_constants::__re_err_empty);
#endif // _LIBCPP_NO_EXCEPTIONS
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_extended_reg_exp(_ForwardIterator __first,
 _ForwardIterator __last)
{
 __owns_one_state<_CharT>* __sa = __end_;
 _ForwardIterator __temp = __parse_ERE_branch(__first, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::__re_err_empty);
#endif // _LIBCPP_NO_EXCEPTIONS
 __first = __temp;
 while (__first != __last && *__first == '|')
 {
 __owns_one_state<_CharT>* __sb = __end_;
 __temp = __parse_ERE_branch(++__first, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::__re_err_empty);
#endif // _LIBCPP_NO_EXCEPTIONS
 __push_alternation(__sa, __sb);
 __first = __temp;
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_ERE_branch(_ForwardIterator __first,
 _ForwardIterator __last)
{
 _ForwardIterator __temp = __parse_ERE_expression(__first, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::__re_err_empty);
#endif // _LIBCPP_NO_EXCEPTIONS
 do
 {
 __first = __temp;
 __temp = __parse_ERE_expression(__first, __last);
 } while (__temp != __first);
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_ERE_expression(_ForwardIterator __first,
 _ForwardIterator __last)
{
 __owns_one_state<_CharT>* __e = __end_;
 unsigned __mexp_begin = __marked_count_;
 _ForwardIterator __temp = __parse_one_char_or_coll_elem_ERE(__first, __last);
 if (__temp == __first && __temp != __last)
 {
 switch (*__temp)
 {
 case '^':
 __push_l_anchor();
 ++__temp;
 break;
 case '$':
 __push_r_anchor();
 ++__temp;
 break;
 case '(':
 __push_begin_marked_subexpression();
 unsigned __temp_count = __marked_count_;
 ++__open_count_;
 __temp = __parse_extended_reg_exp(++__temp, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __last || *__temp != ')')
 throw regex_error(regex_constants::error_paren);
#endif // _LIBCPP_NO_EXCEPTIONS
 __push_end_marked_subexpression(__temp_count);
 --__open_count_;
 ++__temp;
 break;
 }
 }
 if (__temp != __first)
 __temp = __parse_ERE_dupl_symbol(__temp, __last, __e, __mexp_begin+1,
 __marked_count_+1);
 __first = __temp;
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_RE_expression(_ForwardIterator __first,
 _ForwardIterator __last)
{
 while (true)
 {
 _ForwardIterator __temp = __parse_simple_RE(__first, __last);
 if (__temp == __first)
 break;
 __first = __temp;
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_simple_RE(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 __owns_one_state<_CharT>* __e = __end_;
 unsigned __mexp_begin = __marked_count_;
 _ForwardIterator __temp = __parse_nondupl_RE(__first, __last);
 if (__temp != __first)
 __first = __parse_RE_dupl_symbol(__temp, __last, __e,
 __mexp_begin+1, __marked_count_+1);
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_nondupl_RE(_ForwardIterator __first,
 _ForwardIterator __last)
{
 _ForwardIterator __temp = __first;
 __first = __parse_one_char_or_coll_elem_RE(__first, __last);
 if (__temp == __first)
 {
 __temp = __parse_Back_open_paren(__first, __last);
 if (__temp != __first)
 {
 __push_begin_marked_subexpression();
 unsigned __temp_count = __marked_count_;
 __first = __parse_RE_expression(__temp, __last);
 __temp = __parse_Back_close_paren(__first, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::error_paren);
#endif // _LIBCPP_NO_EXCEPTIONS
 __push_end_marked_subexpression(__temp_count);
 __first = __temp;
 }
 else
 __first = __parse_BACKREF(__first, __last);
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_one_char_or_coll_elem_RE(
 _ForwardIterator __first,
 _ForwardIterator __last)
{
 _ForwardIterator __temp = __parse_ORD_CHAR(__first, __last);
 if (__temp == __first)
 {
 __temp = __parse_QUOTED_CHAR(__first, __last);
 if (__temp == __first)
 {
 if (__temp != __last && *__temp == '.')
 {
 __push_match_any();
 ++__temp;
 }
 else
 __temp = __parse_bracket_expression(__first, __last);
 }
 }
 __first = __temp;
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_one_char_or_coll_elem_ERE(
 _ForwardIterator __first,
 _ForwardIterator __last)
{
 _ForwardIterator __temp = __parse_ORD_CHAR_ERE(__first, __last);
 if (__temp == __first)
 {
 __temp = __parse_QUOTED_CHAR_ERE(__first, __last);
 if (__temp == __first)
 {
 if (__temp != __last && *__temp == '.')
 {
 __push_match_any();
 ++__temp;
 }
 else
 __temp = __parse_bracket_expression(__first, __last);
 }
 }
 __first = __temp;
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_Back_open_paren(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__first == '\\' && *__temp == '(')
 __first = ++__temp;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_Back_close_paren(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__first == '\\' && *__temp == ')')
 __first = ++__temp;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_Back_open_brace(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__first == '\\' && *__temp == '{')
 __first = ++__temp;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_Back_close_brace(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__first == '\\' && *__temp == '}')
 __first = ++__temp;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_BACKREF(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__first == '\\')
 { 
 int __val = __traits_.value(*__temp, 10);
 if (__val >= 1 && __val <= 9)
 {
 __push_back_ref(__val);
 __first = ++__temp;
 }
 }
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_ORD_CHAR(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp == __last && *__first == '$')
 return __first;
 // Not called inside a bracket
 if (*__first == '.' || *__first == '\\' || *__first == '[')
 return __first;
 __push_char(*__first);
 ++__first;
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_ORD_CHAR_ERE(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 switch (*__first)
 {
 case '^':
 case '.':
 case '[':
 case '$':
 case '(':
 case '|':
 case '*':
 case '+':
 case '?':
 case '{':
 case '\\':
 break;
 case ')':
 if (__open_count_ == 0)
 {
 __push_char(*__first);
 ++__first;
 }
 break;
 default:
 __push_char(*__first);
 ++__first;
 break;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_QUOTED_CHAR(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__first == '\\')
 {
 switch (*__temp)
 {
 case '^':
 case '.':
 case '*':
 case '[':
 case '$':
 case '\\':
 __push_char(*__temp);
 __first = ++__temp;
 break;
 }
 }
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_QUOTED_CHAR_ERE(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__first == '\\')
 {
 switch (*__temp)
 {
 case '^':
 case '.':
 case '*':
 case '[':
 case '$':
 case '\\':
 case '(':
 case ')':
 case '|':
 case '+':
 case '?':
 case '{':
 case '}':
 __push_char(*__temp);
 __first = ++__temp;
 break;
 default:
 if ((__flags_ & 0x1F0) == awk)
 __first = __parse_awk_escape(++__first, __last);
 break;
 }
 }
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_RE_dupl_symbol(_ForwardIterator __first,
 _ForwardIterator __last,
 __owns_one_state<_CharT>* __s,
 unsigned __mexp_begin,
 unsigned __mexp_end)
{
 if (__first != __last)
 {
 if (*__first == '*')
 {
 __push_greedy_inf_repeat(0, __s, __mexp_begin, __mexp_end);
 ++__first;
 }
 else
 {
 _ForwardIterator __temp = __parse_Back_open_brace(__first, __last);
 if (__temp != __first)
 {
 int __min = 0;
 __first = __temp;
 __temp = __parse_DUP_COUNT(__first, __last, __min);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::error_badbrace);
#endif // _LIBCPP_NO_EXCEPTIONS
 __first = __temp;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_brace);
#endif // _LIBCPP_NO_EXCEPTIONS
 if (*__first != ',')
 {
 __temp = __parse_Back_close_brace(__first, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::error_brace);
#endif // _LIBCPP_NO_EXCEPTIONS
 __push_loop(__min, __min, __s, __mexp_begin, __mexp_end,
 true);
 __first = __temp;
 }
 else
 {
 ++__first; // consume ','
 int __max = -1;
 __first = __parse_DUP_COUNT(__first, __last, __max);
 __temp = __parse_Back_close_brace(__first, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::error_brace);
#endif // _LIBCPP_NO_EXCEPTIONS
 if (__max == -1)
 __push_greedy_inf_repeat(__min, __s, __mexp_begin, __mexp_end);
 else
 {
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__max < __min)
 throw regex_error(regex_constants::error_badbrace);
#endif // _LIBCPP_NO_EXCEPTIONS
 __push_loop(__min, __max, __s, __mexp_begin, __mexp_end,
 true);
 }
 __first = __temp;
 }
 }
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_ERE_dupl_symbol(_ForwardIterator __first,
 _ForwardIterator __last,
 __owns_one_state<_CharT>* __s,
 unsigned __mexp_begin,
 unsigned __mexp_end)
{
 if (__first != __last)
 {
 unsigned __grammar = __flags_ & 0x1F0;
 switch (*__first)
 {
 case '*':
 ++__first;
 if (__grammar == ECMAScript && __first != __last && *__first == '?')
 {
 ++__first;
 __push_nongreedy_inf_repeat(0, __s, __mexp_begin, __mexp_end);
 }
 else
 __push_greedy_inf_repeat(0, __s, __mexp_begin, __mexp_end);
 break;
 case '+':
 ++__first;
 if (__grammar == ECMAScript && __first != __last && *__first == '?')
 {
 ++__first;
 __push_nongreedy_inf_repeat(1, __s, __mexp_begin, __mexp_end);
 }
 else
 __push_greedy_inf_repeat(1, __s, __mexp_begin, __mexp_end);
 break;
 case '?':
 ++__first;
 if (__grammar == ECMAScript && __first != __last && *__first == '?')
 {
 ++__first;
 __push_loop(0, 1, __s, __mexp_begin, __mexp_end, false);
 }
 else
 __push_loop(0, 1, __s, __mexp_begin, __mexp_end);
 break;
 case '{':
 {
 int __min;
 _ForwardIterator __temp = __parse_DUP_COUNT(++__first, __last, __min);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::error_badbrace);
#endif // _LIBCPP_NO_EXCEPTIONS
 __first = __temp;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_brace);
#endif // _LIBCPP_NO_EXCEPTIONS
 switch (*__first)
 {
 case '}':
 ++__first;
 if (__grammar == ECMAScript && __first != __last && *__first == '?')
 {
 ++__first;
 __push_loop(__min, __min, __s, __mexp_begin, __mexp_end, false);
 }
 else
 __push_loop(__min, __min, __s, __mexp_begin, __mexp_end);
 break;
 case ',':
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_badbrace);
#endif // _LIBCPP_NO_EXCEPTIONS
 if (*__first == '}')
 {
 ++__first;
 if (__grammar == ECMAScript && __first != __last && *__first == '?')
 {
 ++__first;
 __push_nongreedy_inf_repeat(__min, __s, __mexp_begin, __mexp_end);
 }
 else
 __push_greedy_inf_repeat(__min, __s, __mexp_begin, __mexp_end);
 }
 else
 {
 int __max = -1;
 __temp = __parse_DUP_COUNT(__first, __last, __max);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __first)
 throw regex_error(regex_constants::error_brace);
#endif // _LIBCPP_NO_EXCEPTIONS
 __first = __temp;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last || *__first != '}')
 throw regex_error(regex_constants::error_brace);
#endif // _LIBCPP_NO_EXCEPTIONS
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__max < __min)
 throw regex_error(regex_constants::error_badbrace);
#endif // _LIBCPP_NO_EXCEPTIONS
 if (__grammar == ECMAScript && __first != __last && *__first == '?')
 {
 ++__first;
 __push_loop(__min, __max, __s, __mexp_begin, __mexp_end, false);
 }
 else
 __push_loop(__min, __max, __s, __mexp_begin, __mexp_end);
 }
 break;
#ifndef _LIBCPP_NO_EXCEPTIONS
 default:
 throw regex_error(regex_constants::error_badbrace);
#endif // _LIBCPP_NO_EXCEPTIONS
 }
 }
 break;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_bracket_expression(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last && *__first == '[')
 {
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 bool __negate = false;
 if (*__first == '^')
 {
 ++__first;
 __negate = true;
 }
 __bracket_expression<_CharT, _Traits>* __ml = __start_matching_list(__negate);
 // __ml owned by *this
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 if ((__flags_ & 0x1F0) != ECMAScript && *__first == ']')
 {
 __ml->__add_char(']');
 ++__first;
 }
 __first = __parse_follow_list(__first, __last, __ml);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 if (*__first == '-')
 {
 __ml->__add_char('-');
 ++__first;
 }
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last || *__first != ']')
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 ++__first;
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_follow_list(_ForwardIterator __first,
 _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml)
{
 if (__first != __last)
 {
 while (true)
 {
 _ForwardIterator __temp = __parse_expression_term(__first, __last,
 __ml);
 if (__temp == __first)
 break;
 __first = __temp;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_expression_term(_ForwardIterator __first,
 _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml)
{
 if (__first != __last && *__first != ']')
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 basic_string<_CharT> __start_range;
 if (__temp != __last && *__first == '[')
 {
 if (*__temp == '=')
 return __parse_equivalence_class(++__temp, __last, __ml);
 else if (*__temp == ':')
 return __parse_character_class(++__temp, __last, __ml);
 else if (*__temp == '.')
 __first = __parse_collating_symbol(++__temp, __last, __start_range);
 }
 unsigned __grammar = __flags_ & 0x1F0;
 if (__start_range.empty())
 {
 if ((__grammar == ECMAScript || __grammar == awk) && *__first == '\\')
 {
 if (__grammar == ECMAScript)
 __first = __parse_class_escape(++__first, __last, __start_range, __ml);
 else
 __first = __parse_awk_escape(++__first, __last, &__start_range);
 }
 else
 {
 __start_range = *__first;
 ++__first;
 }
 }
 if (__first != __last && *__first != ']')
 {
 __temp = _VSTD::next(__first);
 if (__temp != __last && *__first == '-' && *__temp != ']')
 {
 // parse a range
 basic_string<_CharT> __end_range;
 __first = __temp;
 ++__temp;
 if (__temp != __last && *__first == '[' && *__temp == '.')
 __first = __parse_collating_symbol(++__temp, __last, __end_range);
 else
 {
 if ((__grammar == ECMAScript || __grammar == awk) && *__first == '\\')
 {
 if (__grammar == ECMAScript)
 __first = __parse_class_escape(++__first, __last,
 __end_range, __ml);
 else
 __first = __parse_awk_escape(++__first, __last,
 &__end_range);
 }
 else
 {
 __end_range = *__first;
 ++__first;
 }
 }
 __ml->__add_range(_VSTD::move(__start_range), _VSTD::move(__end_range));
 }
 else if (!__start_range.empty())
 {
 if (__start_range.size() == 1)
 __ml->__add_char(__start_range[0]);
 else
 __ml->__add_digraph(__start_range[0], __start_range[1]);
 }
 }
 else if (!__start_range.empty())
 {
 if (__start_range.size() == 1)
 __ml->__add_char(__start_range[0]);
 else
 __ml->__add_digraph(__start_range[0], __start_range[1]);
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_class_escape(_ForwardIterator __first,
 _ForwardIterator __last,
 basic_string<_CharT>& __str,
 __bracket_expression<_CharT, _Traits>* __ml)
{
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 switch (*__first)
 {
 case 0:
 __str = *__first;
 return ++__first;
 case 'b':
 __str = _CharT(8);
 return ++__first;
 case 'd':
 __ml->__add_class(ctype_base::digit);
 return ++__first;
 case 'D':
 __ml->__add_neg_class(ctype_base::digit);
 return ++__first;
 case 's':
 __ml->__add_class(ctype_base::space);
 return ++__first;
 case 'S':
 __ml->__add_neg_class(ctype_base::space);
 return ++__first;
 case 'w':
 __ml->__add_class(ctype_base::alnum);
 __ml->__add_char('_');
 return ++__first;
 case 'W':
 __ml->__add_neg_class(ctype_base::alnum);
 __ml->__add_neg_char('_');
 return ++__first;
 }
 __first = __parse_character_escape(__first, __last, &__str);
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_awk_escape(_ForwardIterator __first,
 _ForwardIterator __last,
 basic_string<_CharT>* __str)
{
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 switch (*__first)
 {
 case '\\':
 case '"':
 case '/':
 if (__str)
 *__str = *__first;
 else
 __push_char(*__first);
 return ++__first;
 case 'a':
 if (__str)
 *__str = _CharT(7);
 else
 __push_char(_CharT(7));
 return ++__first;
 case 'b':
 if (__str)
 *__str = _CharT(8);
 else
 __push_char(_CharT(8));
 return ++__first;
 case 'f':
 if (__str)
 *__str = _CharT(0xC);
 else
 __push_char(_CharT(0xC));
 return ++__first;
 case 'n':
 if (__str)
 *__str = _CharT(0xA);
 else
 __push_char(_CharT(0xA));
 return ++__first;
 case 'r':
 if (__str)
 *__str = _CharT(0xD);
 else
 __push_char(_CharT(0xD));
 return ++__first;
 case 't':
 if (__str)
 *__str = _CharT(0x9);
 else
 __push_char(_CharT(0x9));
 return ++__first;
 case 'v':
 if (__str)
 *__str = _CharT(0xB);
 else
 __push_char(_CharT(0xB));
 return ++__first;
 }
 if ('0' <= *__first && *__first <= '7')
 {
 unsigned __val = *__first - '0';
 if (++__first != __last && ('0' <= *__first && *__first <= '7'))
 {
 __val = 8 * __val + *__first - '0';
 if (++__first != __last && ('0' <= *__first && *__first <= '7'))
 __val = 8 * __val + *__first++ - '0';
 }
 if (__str)
 *__str = _CharT(__val);
 else
 __push_char(_CharT(__val));
 }
#ifndef _LIBCPP_NO_EXCEPTIONS
 else
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_equivalence_class(_ForwardIterator __first,
 _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml)
{
 // Found [=
 // This means =] must exist
 value_type _Equal_close[2] = {'=', ']'};
 _ForwardIterator __temp = _VSTD::search(__first, __last, _Equal_close,
 _Equal_close+2);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __last)
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 // [__first, __temp) contains all text in [= ... =]
 typedef typename _Traits::string_type string_type;
 string_type __collate_name =
 __traits_.lookup_collatename(__first, __temp);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__collate_name.empty())
 throw regex_error(regex_constants::error_collate);
#endif // _LIBCPP_NO_EXCEPTIONS
 string_type __equiv_name =
 __traits_.transform_primary(__collate_name.begin(),
 __collate_name.end());
 if (!__equiv_name.empty())
 __ml->__add_equivalence(__equiv_name);
 else
 {
 switch (__collate_name.size())
 {
 case 1:
 __ml->__add_char(__collate_name[0]);
 break;
 case 2:
 __ml->__add_digraph(__collate_name[0], __collate_name[1]);
 break;
#ifndef _LIBCPP_NO_EXCEPTIONS
 default:
 throw regex_error(regex_constants::error_collate);
#endif // _LIBCPP_NO_EXCEPTIONS
 }
 }
 __first = _VSTD::next(__temp, 2);
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_character_class(_ForwardIterator __first,
 _ForwardIterator __last,
 __bracket_expression<_CharT, _Traits>* __ml)
{
 // Found [:
 // This means :] must exist
 value_type _Colon_close[2] = {':', ']'};
 _ForwardIterator __temp = _VSTD::search(__first, __last, _Colon_close,
 _Colon_close+2);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __last)
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 // [__first, __temp) contains all text in [: ... :]
 typedef typename _Traits::char_class_type char_class_type;
 char_class_type __class_type =
 __traits_.lookup_classname(__first, __temp, __flags_ & icase);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__class_type == 0)
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 __ml->__add_class(__class_type);
 __first = _VSTD::next(__temp, 2);
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_collating_symbol(_ForwardIterator __first,
 _ForwardIterator __last,
 basic_string<_CharT>& __col_sym)
{
 // Found [.
 // This means .] must exist
 value_type _Dot_close[2] = {'.', ']'};
 _ForwardIterator __temp = _VSTD::search(__first, __last, _Dot_close,
 _Dot_close+2);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __last)
 throw regex_error(regex_constants::error_brack);
#endif // _LIBCPP_NO_EXCEPTIONS
 // [__first, __temp) contains all text in [. ... .]
 typedef typename _Traits::string_type string_type;
 __col_sym = __traits_.lookup_collatename(__first, __temp);
 switch (__col_sym.size())
 {
 case 1:
 case 2:
 break;
#ifndef _LIBCPP_NO_EXCEPTIONS
 default:
 throw regex_error(regex_constants::error_collate);
#endif // _LIBCPP_NO_EXCEPTIONS
 }
 __first = _VSTD::next(__temp, 2);
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_DUP_COUNT(_ForwardIterator __first,
 _ForwardIterator __last,
 int& __c)
{
 if (__first != __last )
 {
 int __val = __traits_.value(*__first, 10);
 if ( __val != -1 )
 {
 __c = __val;
 for (++__first; 
 __first != __last && ( __val = __traits_.value(*__first, 10)) != -1;
 ++__first)
 {
 __c *= 10;
 __c += __val;
 }
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_ecma_exp(_ForwardIterator __first,
 _ForwardIterator __last)
{
 __owns_one_state<_CharT>* __sa = __end_;
 _ForwardIterator __temp = __parse_alternative(__first, __last);
 if (__temp == __first)
 __push_empty();
 __first = __temp;
 while (__first != __last && *__first == '|')
 {
 __owns_one_state<_CharT>* __sb = __end_;
 __temp = __parse_alternative(++__first, __last);
 if (__temp == __first)
 __push_empty();
 __push_alternation(__sa, __sb);
 __first = __temp;
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_alternative(_ForwardIterator __first,
 _ForwardIterator __last)
{
 while (true)
 {
 _ForwardIterator __temp = __parse_term(__first, __last);
 if (__temp == __first)
 break;
 __first = __temp;
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_term(_ForwardIterator __first,
 _ForwardIterator __last)
{
 _ForwardIterator __temp = __parse_assertion(__first, __last);
 if (__temp == __first)
 {
 __owns_one_state<_CharT>* __e = __end_;
 unsigned __mexp_begin = __marked_count_;
 __temp = __parse_atom(__first, __last);
 if (__temp != __first)
 __first = __parse_ERE_dupl_symbol(__temp, __last, __e,
 __mexp_begin+1, __marked_count_+1);
 }
 else
 __first = __temp;
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_assertion(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 switch (*__first)
 {
 case '^':
 __push_l_anchor();
 ++__first;
 break;
 case '$':
 __push_r_anchor();
 ++__first;
 break;
 case '\\':
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last)
 {
 if (*__temp == 'b')
 {
 __push_word_boundary(false);
 __first = ++__temp;
 }
 else if (*__temp == 'B')
 {
 __push_word_boundary(true);
 __first = ++__temp;
 }
 }
 }
 break;
 case '(':
 {
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last && *__temp == '?')
 {
 if (++__temp != __last)
 {
 switch (*__temp)
 {
 case '=':
 {
 basic_regex __exp;
 __exp.__flags_ = __flags_;
 __temp = __exp.__parse(++__temp, __last);
 unsigned __mexp = __exp.__marked_count_;
 __push_lookahead(_VSTD::move(__exp), false, __marked_count_);
 __marked_count_ += __mexp;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __last || *__temp != ')')
 throw regex_error(regex_constants::error_paren);
#endif // _LIBCPP_NO_EXCEPTIONS
 __first = ++__temp;
 }
 break;
 case '!':
 {
 basic_regex __exp;
 __exp.__flags_ = __flags_;
 __temp = __exp.__parse(++__temp, __last);
 unsigned __mexp = __exp.__marked_count_;
 __push_lookahead(_VSTD::move(__exp), true, __marked_count_);
 __marked_count_ += __mexp;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__temp == __last || *__temp != ')')
 throw regex_error(regex_constants::error_paren);
#endif // _LIBCPP_NO_EXCEPTIONS
 __first = ++__temp;
 }
 break;
 }
 }
 }
 }
 break;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_atom(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 switch (*__first)
 {
 case '.':
 __push_match_any_but_newline();
 ++__first;
 break;
 case '\\':
 __first = __parse_atom_escape(__first, __last);
 break;
 case '[':
 __first = __parse_bracket_expression(__first, __last);
 break;
 case '(':
 {
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_paren);
#endif // _LIBCPP_NO_EXCEPTIONS
 _ForwardIterator __temp = _VSTD::next(__first);
 if (__temp != __last && *__first == '?' && *__temp == ':')
 {
 ++__open_count_;
 __first = __parse_ecma_exp(++__temp, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last || *__first != ')')
 throw regex_error(regex_constants::error_paren);
#endif // _LIBCPP_NO_EXCEPTIONS
 --__open_count_;
 ++__first;
 }
 else
 {
 __push_begin_marked_subexpression();
 unsigned __temp_count = __marked_count_;
 ++__open_count_;
 __first = __parse_ecma_exp(__first, __last);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last || *__first != ')')
 throw regex_error(regex_constants::error_paren);
#endif // _LIBCPP_NO_EXCEPTIONS
 __push_end_marked_subexpression(__temp_count);
 --__open_count_;
 ++__first;
 }
 }
 break;
 default:
 __first = __parse_pattern_character(__first, __last);
 break;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_atom_escape(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last && *__first == '\\')
 {
 _ForwardIterator __t1 = _VSTD::next(__first);
 _ForwardIterator __t2 = __parse_decimal_escape(__t1, __last);
 if (__t2 != __t1)
 __first = __t2;
 else
 {
 __t2 = __parse_character_class_escape(__t1, __last);
 if (__t2 != __t1)
 __first = __t2;
 else
 {
 __t2 = __parse_character_escape(__t1, __last);
 if (__t2 != __t1)
 __first = __t2;
 }
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_decimal_escape(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 if (*__first == '0')
 {
 __push_char(_CharT());
 ++__first;
 }
 else if ('1' <= *__first && *__first <= '9')
 {
 unsigned __v = *__first - '0';
 for (++__first; '0' <= *__first && *__first <= '9'; ++__first)
 __v = 10 * __v + *__first - '0';
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__v > mark_count())
 throw regex_error(regex_constants::error_backref);
#endif // _LIBCPP_NO_EXCEPTIONS
 __push_back_ref(__v);
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_character_class_escape(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 __bracket_expression<_CharT, _Traits>* __ml;
 switch (*__first)
 {
 case 'd':
 __ml = __start_matching_list(false);
 __ml->__add_class(ctype_base::digit);
 ++__first;
 break;
 case 'D':
 __ml = __start_matching_list(true);
 __ml->__add_class(ctype_base::digit);
 ++__first;
 break;
 case 's':
 __ml = __start_matching_list(false);
 __ml->__add_class(ctype_base::space);
 ++__first;
 break;
 case 'S':
 __ml = __start_matching_list(true);
 __ml->__add_class(ctype_base::space);
 ++__first;
 break;
 case 'w':
 __ml = __start_matching_list(false);
 __ml->__add_class(ctype_base::alnum);
 __ml->__add_char('_');
 ++__first;
 break;
 case 'W':
 __ml = __start_matching_list(true);
 __ml->__add_class(ctype_base::alnum);
 __ml->__add_char('_');
 ++__first;
 break;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_character_escape(_ForwardIterator __first,
 _ForwardIterator __last,
 basic_string<_CharT>* __str)
{
 if (__first != __last)
 {
 _ForwardIterator __t;
 unsigned __sum = 0;
 int __hd;
 switch (*__first)
 {
 case 'f':
 if (__str)
 *__str = _CharT(0xC);
 else
 __push_char(_CharT(0xC));
 ++__first;
 break;
 case 'n':
 if (__str)
 *__str = _CharT(0xA);
 else
 __push_char(_CharT(0xA));
 ++__first;
 break;
 case 'r':
 if (__str)
 *__str = _CharT(0xD);
 else
 __push_char(_CharT(0xD));
 ++__first;
 break;
 case 't':
 if (__str)
 *__str = _CharT(0x9);
 else
 __push_char(_CharT(0x9));
 ++__first;
 break;
 case 'v':
 if (__str)
 *__str = _CharT(0xB);
 else
 __push_char(_CharT(0xB));
 ++__first;
 break;
 case 'c':
 if ((__t = _VSTD::next(__first)) != __last)
 {
 if (('A' <= *__t && *__t <= 'Z') || 
 ('a' <= *__t && *__t <= 'z'))
 {
 if (__str)
 *__str = _CharT(*__t % 32);
 else
 __push_char(_CharT(*__t % 32));
 __first = ++__t;
 }
#ifndef _LIBCPP_NO_EXCEPTIONS
 else 
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 }
#ifndef _LIBCPP_NO_EXCEPTIONS
 else
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 break;
 case 'u':
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __hd = __traits_.value(*__first, 16);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__hd == -1)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __sum = 16 * __sum + static_cast<unsigned>(__hd);
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __hd = __traits_.value(*__first, 16);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__hd == -1)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __sum = 16 * __sum + static_cast<unsigned>(__hd);
 // drop through
 case 'x':
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __hd = __traits_.value(*__first, 16);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__hd == -1)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __sum = 16 * __sum + static_cast<unsigned>(__hd);
 ++__first;
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__first == __last)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __hd = __traits_.value(*__first, 16);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__hd == -1)
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 __sum = 16 * __sum + static_cast<unsigned>(__hd);
 if (__str)
 *__str = _CharT(__sum);
 else
 __push_char(_CharT(__sum));
 ++__first;
 break;
 case '0':
 if (__str)
 *__str = _CharT(0);
 else
 __push_char(_CharT(0));
 ++__first;
 break;
 default:
 if (*__first != '_' && !__traits_.isctype(*__first, ctype_base::alnum))
 {
 if (__str)
 *__str = *__first;
 else
 __push_char(*__first);
 ++__first;
 }
#ifndef _LIBCPP_NO_EXCEPTIONS
 else
 throw regex_error(regex_constants::error_escape);
#endif // _LIBCPP_NO_EXCEPTIONS
 break;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_pattern_character(_ForwardIterator __first,
 _ForwardIterator __last)
{
 if (__first != __last)
 {
 switch (*__first)
 {
 case '^':
 case '$':
 case '\\':
 case '.':
 case '*':
 case '+':
 case '?':
 case '(':
 case ')':
 case '[':
 case ']':
 case '{':
 case '}':
 case '|':
 break;
 default:
 __push_char(*__first);
 ++__first;
 break;
 }
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_grep(_ForwardIterator __first,
 _ForwardIterator __last)
{
 __owns_one_state<_CharT>* __sa = __end_;
 _ForwardIterator __t1 = _VSTD::find(__first, __last, _CharT('\n'));
 if (__t1 != __first)
 __parse_basic_reg_exp(__first, __t1);
 else
 __push_empty();
 __first = __t1;
 if (__first != __last)
 ++__first;
 while (__first != __last)
 {
 __t1 = _VSTD::find(__first, __last, _CharT('\n'));
 __owns_one_state<_CharT>* __sb = __end_;
 if (__t1 != __first)
 __parse_basic_reg_exp(__first, __t1);
 else
 __push_empty();
 __push_alternation(__sa, __sb);
 __first = __t1;
 if (__first != __last)
 ++__first;
 }
 return __first;
}

template <class _CharT, class _Traits>
template <class _ForwardIterator>
_ForwardIterator
basic_regex<_CharT, _Traits>::__parse_egrep(_ForwardIterator __first,
 _ForwardIterator __last)
{
 __owns_one_state<_CharT>* __sa = __end_;
 _ForwardIterator __t1 = _VSTD::find(__first, __last, _CharT('\n'));
 if (__t1 != __first)
 __parse_extended_reg_exp(__first, __t1);
 else
 __push_empty();
 __first = __t1;
 if (__first != __last)
 ++__first;
 while (__first != __last)
 {
 __t1 = _VSTD::find(__first, __last, _CharT('\n'));
 __owns_one_state<_CharT>* __sb = __end_;
 if (__t1 != __first)
 __parse_extended_reg_exp(__first, __t1);
 else
 __push_empty();
 __push_alternation(__sa, __sb);
 __first = __t1;
 if (__first != __last)
 ++__first;
 }
 return __first;
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_loop(size_t __min, size_t __max,
 __owns_one_state<_CharT>* __s, size_t __mexp_begin, size_t __mexp_end,
 bool __greedy)
{
 unique_ptr<__empty_state<_CharT> > __e1(new __empty_state<_CharT>(__end_->first()));
 __end_->first() = nullptr;
 unique_ptr<__loop<_CharT> > __e2(new __loop<_CharT>(__loop_count_,
 __s->first(), __e1.get(), __mexp_begin, __mexp_end, __greedy,
 __min, __max));
 __s->first() = nullptr;
 __e1.release();
 __end_->first() = new __repeat_one_loop<_CharT>(__e2.get());
 __end_ = __e2->second();
 __s->first() = __e2.release();
 ++__loop_count_;
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_char(value_type __c)
{
 if (flags() & icase)
 __end_->first() = new __match_char_icase<_CharT, _Traits>
 (__traits_, __c, __end_->first());
 else if (flags() & collate)
 __end_->first() = new __match_char_collate<_CharT, _Traits>
 (__traits_, __c, __end_->first());
 else
 __end_->first() = new __match_char<_CharT>(__c, __end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_begin_marked_subexpression()
{
 if (!(__flags_ & nosubs))
 {
 __end_->first() =
 new __begin_marked_subexpression<_CharT>(++__marked_count_,
 __end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
 }
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_end_marked_subexpression(unsigned __sub)
{
 if (!(__flags_ & nosubs))
 {
 __end_->first() =
 new __end_marked_subexpression<_CharT>(__sub, __end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
 }
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_l_anchor()
{
 __end_->first() = new __l_anchor<_CharT>(__end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_r_anchor()
{
 __end_->first() = new __r_anchor<_CharT>(__end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_match_any()
{
 __end_->first() = new __match_any<_CharT>(__end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_match_any_but_newline()
{
 __end_->first() = new __match_any_but_newline<_CharT>(__end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_empty()
{
 __end_->first() = new __empty_state<_CharT>(__end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_word_boundary(bool __invert)
{
 __end_->first() = new __word_boundary<_CharT, _Traits>(__traits_, __invert,
 __end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_back_ref(int __i)
{
 if (flags() & icase)
 __end_->first() = new __back_ref_icase<_CharT, _Traits>
 (__traits_, __i, __end_->first());
 else if (flags() & collate)
 __end_->first() = new __back_ref_collate<_CharT, _Traits>
 (__traits_, __i, __end_->first());
 else
 __end_->first() = new __back_ref<_CharT>(__i, __end_->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_alternation(__owns_one_state<_CharT>* __sa,
 __owns_one_state<_CharT>* __ea)
{
 __sa->first() = new __alternate<_CharT>(
 static_cast<__owns_one_state<_CharT>*>(__sa->first()),
 static_cast<__owns_one_state<_CharT>*>(__ea->first()));
 __ea->first() = nullptr;
 __ea->first() = new __empty_state<_CharT>(__end_->first());
 __end_->first() = nullptr;
 __end_->first() = new __empty_non_own_state<_CharT>(__ea->first());
 __end_ = static_cast<__owns_one_state<_CharT>*>(__ea->first());
}

template <class _CharT, class _Traits>
__bracket_expression<_CharT, _Traits>*
basic_regex<_CharT, _Traits>::__start_matching_list(bool __negate)
{
 __bracket_expression<_CharT, _Traits>* __r =
 new __bracket_expression<_CharT, _Traits>(__traits_, __end_->first(),
 __negate, __flags_ & icase,
 __flags_ & collate);
 __end_->first() = __r;
 __end_ = __r;
 return __r;
}

template <class _CharT, class _Traits>
void
basic_regex<_CharT, _Traits>::__push_lookahead(const basic_regex& __exp,
 bool __invert,
 unsigned __mexp)
{
 __end_->first() = new __lookahead<_CharT, _Traits>(__exp, __invert,
 __end_->first(), __mexp);
 __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
}

typedef basic_regex<char> regex;
typedef basic_regex<wchar_t> wregex;

// sub_match

template <class _BidirectionalIterator>
class _LIBCPP_TYPE_VIS_ONLY sub_match
 : public pair<_BidirectionalIterator, _BidirectionalIterator>
{
public:
 typedef _BidirectionalIterator iterator;
 typedef typename iterator_traits<iterator>::value_type value_type;
 typedef typename iterator_traits<iterator>::difference_type difference_type;
 typedef basic_string<value_type> string_type;

 bool matched;

 _LIBCPP_INLINE_VISIBILITY
 _LIBCPP_CONSTEXPR sub_match() : matched() {}

 _LIBCPP_INLINE_VISIBILITY
 difference_type length() const
 {return matched ? _VSTD::distance(this->first, this->second) : 0;}
 _LIBCPP_INLINE_VISIBILITY
 string_type str() const
 {return matched ? string_type(this->first, this->second) : string_type();}
 _LIBCPP_INLINE_VISIBILITY
 operator string_type() const
 {return str();}

 _LIBCPP_INLINE_VISIBILITY
 int compare(const sub_match& __s) const
 {return str().compare(__s.str());}
 _LIBCPP_INLINE_VISIBILITY
 int compare(const string_type& __s) const
 {return str().compare(__s);}
 _LIBCPP_INLINE_VISIBILITY
 int compare(const value_type* __s) const
 {return str().compare(__s);}
};

typedef sub_match<const char*> csub_match;
typedef sub_match<const wchar_t*> wcsub_match;
typedef sub_match<string::const_iterator> ssub_match;
typedef sub_match<wstring::const_iterator> wssub_match;

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const sub_match<_BiIter>& __x, const sub_match<_BiIter>& __y)
{
 return __x.compare(__y) == 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const sub_match<_BiIter>& __x, const sub_match<_BiIter>& __y)
{
 return !(__x == __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const sub_match<_BiIter>& __x, const sub_match<_BiIter>& __y)
{
 return __x.compare(__y) < 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const sub_match<_BiIter>& __x, const sub_match<_BiIter>& __y)
{
 return !(__y < __x);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const sub_match<_BiIter>& __x, const sub_match<_BiIter>& __y)
{
 return !(__x < __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>(const sub_match<_BiIter>& __x, const sub_match<_BiIter>& __y)
{
 return __y < __x;
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __x,
 const sub_match<_BiIter>& __y)
{
 return __y.compare(__x.c_str()) == 0;
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __x,
 const sub_match<_BiIter>& __y)
{
 return !(__x == __y);
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __x,
 const sub_match<_BiIter>& __y)
{
 return __y.compare(__x.c_str()) > 0;
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>(const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __x,
 const sub_match<_BiIter>& __y)
{
 return __y < __x;
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool operator>=(const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __x,
 const sub_match<_BiIter>& __y)
{
 return !(__x < __y);
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __x,
 const sub_match<_BiIter>& __y)
{
 return !(__y < __x);
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const sub_match<_BiIter>& __x,
 const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __y)
{
 return __x.compare(__y.c_str()) == 0;
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const sub_match<_BiIter>& __x,
 const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __y)
{
 return !(__x == __y);
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const sub_match<_BiIter>& __x,
 const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __y)
{
 return __x.compare(__y.c_str()) < 0;
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool operator>(const sub_match<_BiIter>& __x,
 const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __y)
{
 return __y < __x;
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const sub_match<_BiIter>& __x,
 const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __y)
{
 return !(__x < __y);
}

template <class _BiIter, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const sub_match<_BiIter>& __x,
 const basic_string<typename iterator_traits<_BiIter>::value_type, _ST, _SA>& __y)
{
 return !(__y < __x);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(typename iterator_traits<_BiIter>::value_type const* __x,
 const sub_match<_BiIter>& __y)
{
 return __y.compare(__x) == 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(typename iterator_traits<_BiIter>::value_type const* __x,
 const sub_match<_BiIter>& __y)
{
 return !(__x == __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(typename iterator_traits<_BiIter>::value_type const* __x,
 const sub_match<_BiIter>& __y)
{
 return __y.compare(__x) > 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>(typename iterator_traits<_BiIter>::value_type const* __x,
 const sub_match<_BiIter>& __y)
{
 return __y < __x;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(typename iterator_traits<_BiIter>::value_type const* __x,
 const sub_match<_BiIter>& __y)
{
 return !(__x < __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(typename iterator_traits<_BiIter>::value_type const* __x,
 const sub_match<_BiIter>& __y)
{
 return !(__y < __x);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const* __y)
{
 return __x.compare(__y) == 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const* __y)
{
 return !(__x == __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const* __y)
{
 return __x.compare(__y) < 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const* __y)
{
 return __y < __x;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const* __y)
{
 return !(__x < __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const* __y)
{
 return !(__y < __x);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(typename iterator_traits<_BiIter>::value_type const& __x,
 const sub_match<_BiIter>& __y)
{
 typedef basic_string<typename iterator_traits<_BiIter>::value_type> string_type;
 return __y.compare(string_type(1, __x)) == 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(typename iterator_traits<_BiIter>::value_type const& __x,
 const sub_match<_BiIter>& __y)
{
 return !(__x == __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(typename iterator_traits<_BiIter>::value_type const& __x,
 const sub_match<_BiIter>& __y)
{
 typedef basic_string<typename iterator_traits<_BiIter>::value_type> string_type;
 return __y.compare(string_type(1, __x)) > 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>(typename iterator_traits<_BiIter>::value_type const& __x,
 const sub_match<_BiIter>& __y)
{
 return __y < __x;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(typename iterator_traits<_BiIter>::value_type const& __x,
 const sub_match<_BiIter>& __y)
{
 return !(__x < __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(typename iterator_traits<_BiIter>::value_type const& __x,
 const sub_match<_BiIter>& __y)
{
 return !(__y < __x);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const& __y)
{
 typedef basic_string<typename iterator_traits<_BiIter>::value_type> string_type;
 return __x.compare(string_type(1, __y)) == 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const& __y)
{
 return !(__x == __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const& __y)
{
 typedef basic_string<typename iterator_traits<_BiIter>::value_type> string_type;
 return __x.compare(string_type(1, __y)) < 0;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const& __y)
{
 return __y < __x;
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const& __y)
{
 return !(__x < __y);
}

template <class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const sub_match<_BiIter>& __x,
 typename iterator_traits<_BiIter>::value_type const& __y)
{
 return !(__y < __x);
}

template <class _CharT, class _ST, class _BiIter>
inline _LIBCPP_INLINE_VISIBILITY
basic_ostream<_CharT, _ST>&
operator<<(basic_ostream<_CharT, _ST>& __os, const sub_match<_BiIter>& __m)
{
 return __os << __m.str();
}

template <class _BidirectionalIterator, class _Allocator>
class _LIBCPP_TYPE_VIS_ONLY match_results
{
public:
 typedef _Allocator allocator_type;
 typedef sub_match<_BidirectionalIterator> value_type;
private:
 typedef vector<value_type, allocator_type> __container_type;

 __container_type __matches_;
 value_type __unmatched_;
 value_type __prefix_;
 value_type __suffix_;
 bool __ready_;
public:
 _BidirectionalIterator __position_start_;
 typedef const value_type& const_reference;
 typedef value_type& reference;
 typedef typename __container_type::const_iterator const_iterator;
 typedef const_iterator iterator;
 typedef typename iterator_traits<_BidirectionalIterator>::difference_type difference_type;
 typedef typename allocator_traits<allocator_type>::size_type size_type;
 typedef typename iterator_traits<_BidirectionalIterator>::value_type char_type;
 typedef basic_string<char_type> string_type;

 // construct/copy/destroy:
 explicit match_results(const allocator_type& __a = allocator_type());
// match_results(const match_results&) = default;
// match_results& operator=(const match_results&) = default;
// match_results(match_results&& __m) = default;
// match_results& operator=(match_results&& __m) = default;
// ~match_results() = default;

 _LIBCPP_INLINE_VISIBILITY
 bool ready() const {return __ready_;}

 // size:
 _LIBCPP_INLINE_VISIBILITY
 size_type size() const {return __matches_.size();}
 _LIBCPP_INLINE_VISIBILITY
 size_type max_size() const {return __matches_.max_size();}
 _LIBCPP_INLINE_VISIBILITY
 bool empty() const {return size() == 0;}

 // element access:
 _LIBCPP_INLINE_VISIBILITY
 difference_type length(size_type __sub = 0) const
 {return (*this)[__sub].length();}
 _LIBCPP_INLINE_VISIBILITY
 difference_type position(size_type __sub = 0) const
 {return _VSTD::distance(__position_start_, (*this)[__sub].first);}
 _LIBCPP_INLINE_VISIBILITY
 string_type str(size_type __sub = 0) const
 {return (*this)[__sub].str();}
 _LIBCPP_INLINE_VISIBILITY
 const_reference operator[](size_type __n) const
 {return __n < __matches_.size() ? __matches_[__n] : __unmatched_;}

 _LIBCPP_INLINE_VISIBILITY
 const_reference prefix() const {return __prefix_;}
 _LIBCPP_INLINE_VISIBILITY
 const_reference suffix() const {return __suffix_;}

 _LIBCPP_INLINE_VISIBILITY
 const_iterator begin() const {return empty() ? __matches_.end() : __matches_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator end() const {return __matches_.end();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cbegin() const {return empty() ? __matches_.end() : __matches_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cend() const {return __matches_.end();}

 // format:
 template <class _OutputIter>
 _OutputIter
 format(_OutputIter __out, const char_type* __fmt_first,
 const char_type* __fmt_last,
 regex_constants::match_flag_type __flags = regex_constants::format_default) const;
 template <class _OutputIter, class _ST, class _SA>
 _LIBCPP_INLINE_VISIBILITY
 _OutputIter
 format(_OutputIter __out, const basic_string<char_type, _ST, _SA>& __fmt,
 regex_constants::match_flag_type __flags = regex_constants::format_default) const
 {return format(__out, __fmt.data(), __fmt.data() + __fmt.size(), __flags);}
 template <class _ST, class _SA>
 _LIBCPP_INLINE_VISIBILITY
 basic_string<char_type, _ST, _SA>
 format(const basic_string<char_type, _ST, _SA>& __fmt,
 regex_constants::match_flag_type __flags = regex_constants::format_default) const
 {
 basic_string<char_type, _ST, _SA> __r;
 format(back_inserter(__r), __fmt.data(), __fmt.data() + __fmt.size(),
 __flags);
 return __r;
 }
 _LIBCPP_INLINE_VISIBILITY
 string_type
 format(const char_type* __fmt,
 regex_constants::match_flag_type __flags = regex_constants::format_default) const
 {
 string_type __r;
 format(back_inserter(__r), __fmt,
 __fmt + char_traits<char_type>::length(__fmt), __flags);
 return __r;
 }

 // allocator:
 _LIBCPP_INLINE_VISIBILITY
 allocator_type get_allocator() const {return __matches_.get_allocator();}

 // swap:
 void swap(match_results& __m);

 template <class _Bp, class _Ap>
 _LIBCPP_INLINE_VISIBILITY
 void __assign(_BidirectionalIterator __f, _BidirectionalIterator __l,
 const match_results<_Bp, _Ap>& __m, bool __no_update_pos)
 {
 _Bp __mf = __m.prefix().first;
 __matches_.resize(__m.size());
 for (size_type __i = 0; __i < __matches_.size(); ++__i)
 {
 __matches_[__i].first = _VSTD::next(__f, _VSTD::distance(__mf, __m[__i].first));
 __matches_[__i].second = _VSTD::next(__f, _VSTD::distance(__mf, __m[__i].second));
 __matches_[__i].matched = __m[__i].matched;
 }
 __unmatched_.first = __l;
 __unmatched_.second = __l;
 __unmatched_.matched = false;
 __prefix_.first = _VSTD::next(__f, _VSTD::distance(__mf, __m.prefix().first));
 __prefix_.second = _VSTD::next(__f, _VSTD::distance(__mf, __m.prefix().second));
 __prefix_.matched = __m.prefix().matched;
 __suffix_.first = _VSTD::next(__f, _VSTD::distance(__mf, __m.suffix().first));
 __suffix_.second = _VSTD::next(__f, _VSTD::distance(__mf, __m.suffix().second));
 __suffix_.matched = __m.suffix().matched;
 if (!__no_update_pos)
 __position_start_ = __prefix_.first;
 __ready_ = __m.ready();
 }

private:
 void __init(unsigned __s,
 _BidirectionalIterator __f, _BidirectionalIterator __l,
 bool __no_update_pos = false);

 template <class, class> friend class basic_regex;

 template <class _Bp, class _Ap, class _Cp, class _Tp>
 friend
 bool
 regex_match(_Bp, _Bp, match_results<_Bp, _Ap>&, const basic_regex<_Cp, _Tp>&,
 regex_constants::match_flag_type);

 template <class _Bp, class _Ap>
 friend
 bool
 operator==(const match_results<_Bp, _Ap>&, const match_results<_Bp, _Ap>&);

 template <class, class> friend class __lookahead;
};

template <class _BidirectionalIterator, class _Allocator>
match_results<_BidirectionalIterator, _Allocator>::match_results(
 const allocator_type& __a)
 : __matches_(__a),
 __unmatched_(),
 __prefix_(),
 __suffix_(),
 __position_start_(),
 __ready_(false)
{
}

template <class _BidirectionalIterator, class _Allocator>
void
match_results<_BidirectionalIterator, _Allocator>::__init(unsigned __s,
 _BidirectionalIterator __f, _BidirectionalIterator __l,
 bool __no_update_pos)
{
 __unmatched_.first = __l;
 __unmatched_.second = __l;
 __unmatched_.matched = false;
 __matches_.assign(__s, __unmatched_);
 __prefix_.first = __f;
 __prefix_.second = __f;
 __prefix_.matched = false;
 __suffix_ = __unmatched_;
 if (!__no_update_pos)
 __position_start_ = __prefix_.first;
 __ready_ = true;
}

template <class _BidirectionalIterator, class _Allocator>
template <class _OutputIter>
_OutputIter
match_results<_BidirectionalIterator, _Allocator>::format(_OutputIter __out,
 const char_type* __fmt_first, const char_type* __fmt_last,
 regex_constants::match_flag_type __flags) const
{
 if (__flags & regex_constants::format_sed)
 {
 for (; __fmt_first != __fmt_last; ++__fmt_first)
 {
 if (*__fmt_first == '&')
 __out = _VSTD::copy(__matches_[0].first, __matches_[0].second,
 __out);
 else if (*__fmt_first == '\\' && __fmt_first + 1 != __fmt_last)
 {
 ++__fmt_first;
 if ('0' <= *__fmt_first && *__fmt_first <= '9')
 {
 size_t __i = *__fmt_first - '0';
 __out = _VSTD::copy(__matches_[__i].first,
 __matches_[__i].second, __out);
 }
 else
 {
 *__out = *__fmt_first;
 ++__out;
 }
 }
 else
 {
 *__out = *__fmt_first;
 ++__out;
 }
 }
 }
 else
 {
 for (; __fmt_first != __fmt_last; ++__fmt_first)
 {
 if (*__fmt_first == '$' && __fmt_first + 1 != __fmt_last)
 {
 switch (__fmt_first[1])
 {
 case '$':
 *__out = *++__fmt_first;
 ++__out;
 break;
 case '&':
 ++__fmt_first;
 __out = _VSTD::copy(__matches_[0].first, __matches_[0].second,
 __out);
 break;
 case '`':
 ++__fmt_first;
 __out = _VSTD::copy(__prefix_.first, __prefix_.second, __out);
 break;
 case '\'':
 ++__fmt_first;
 __out = _VSTD::copy(__suffix_.first, __suffix_.second, __out);
 break;
 default:
 if ('0' <= __fmt_first[1] && __fmt_first[1] <= '9')
 {
 ++__fmt_first;
 size_t __i = *__fmt_first - '0';
 if (__fmt_first + 1 != __fmt_last &&
 '0' <= __fmt_first[1] && __fmt_first[1] <= '9')
 {
 ++__fmt_first;
 __i = 10 * __i + *__fmt_first - '0';
 }
 __out = _VSTD::copy(__matches_[__i].first,
 __matches_[__i].second, __out);
 }
 else
 {
 *__out = *__fmt_first;
 ++__out;
 }
 break;
 }
 }
 else
 {
 *__out = *__fmt_first;
 ++__out;
 }
 }
 }
 return __out;
}

template <class _BidirectionalIterator, class _Allocator>
void
match_results<_BidirectionalIterator, _Allocator>::swap(match_results& __m)
{
 using _VSTD::swap;
 swap(__matches_, __m.__matches_);
 swap(__unmatched_, __m.__unmatched_);
 swap(__prefix_, __m.__prefix_);
 swap(__suffix_, __m.__suffix_);
 swap(__position_start_, __m.__position_start_);
 swap(__ready_, __m.__ready_);
}

typedef match_results<const char*> cmatch;
typedef match_results<const wchar_t*> wcmatch;
typedef match_results<string::const_iterator> smatch;
typedef match_results<wstring::const_iterator> wsmatch;

template <class _BidirectionalIterator, class _Allocator>
bool
operator==(const match_results<_BidirectionalIterator, _Allocator>& __x,
 const match_results<_BidirectionalIterator, _Allocator>& __y)
{
 if (__x.__ready_ != __y.__ready_)
 return false;
 if (!__x.__ready_)
 return true;
 return __x.__matches_ == __y.__matches_ &&
 __x.__prefix_ == __y.__prefix_ &&
 __x.__suffix_ == __y.__suffix_;
}

template <class _BidirectionalIterator, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const match_results<_BidirectionalIterator, _Allocator>& __x,
 const match_results<_BidirectionalIterator, _Allocator>& __y)
{
 return !(__x == __y);
}

template <class _BidirectionalIterator, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(match_results<_BidirectionalIterator, _Allocator>& __x,
 match_results<_BidirectionalIterator, _Allocator>& __y)
{
 __x.swap(__y);
}

// regex_search

template <class _CharT, class _Traits>
template <class _Allocator>
bool
basic_regex<_CharT, _Traits>::__match_at_start_ecma(
 const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool __at_first) const
{
 vector<__state> __states;
 __node* __st = __start_.get();
 if (__st)
 {
 __states.push_back(__state());
 __states.back().__do_ = 0;
 __states.back().__first_ = __first;
 __states.back().__current_ = __first;
 __states.back().__last_ = __last;
 __states.back().__sub_matches_.resize(mark_count());
 __states.back().__loop_data_.resize(__loop_count());
 __states.back().__node_ = __st;
 __states.back().__flags_ = __flags;
 __states.back().__at_first_ = __at_first;
 do
 {
 __state& __s = __states.back();
 if (__s.__node_)
 __s.__node_->__exec(__s);
 switch (__s.__do_)
 {
 case __state::__end_state:
 __m.__matches_[0].first = __first;
 __m.__matches_[0].second = _VSTD::next(__first, __s.__current_ - __first);
 __m.__matches_[0].matched = true;
 for (unsigned __i = 0; __i < __s.__sub_matches_.size(); ++__i)
 __m.__matches_[__i+1] = __s.__sub_matches_[__i];
 return true;
 case __state::__accept_and_consume:
 case __state::__repeat:
 case __state::__accept_but_not_consume:
 break;
 case __state::__split:
 {
 __state __snext = __s;
 __s.__node_->__exec_split(true, __s);
 __snext.__node_->__exec_split(false, __snext);
 __states.push_back(_VSTD::move(__snext));
 }
 break;
 case __state::__reject:
 __states.pop_back();
 break;
 default:
#ifndef _LIBCPP_NO_EXCEPTIONS
 throw regex_error(regex_constants::__re_err_unknown);
#endif
 break;

 }
 } while (!__states.empty());
 }
 return false;
}

template <class _CharT, class _Traits>
template <class _Allocator>
bool
basic_regex<_CharT, _Traits>::__match_at_start_posix_nosubs(
 const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool __at_first) const
{
 deque<__state> __states;
 ptrdiff_t __highest_j = 0;
 ptrdiff_t _Np = _VSTD::distance(__first, __last);
 __node* __st = __start_.get();
 if (__st)
 {
 __states.push_back(__state());
 __states.back().__do_ = 0;
 __states.back().__first_ = __first;
 __states.back().__current_ = __first;
 __states.back().__last_ = __last;
 __states.back().__loop_data_.resize(__loop_count());
 __states.back().__node_ = __st;
 __states.back().__flags_ = __flags;
 __states.back().__at_first_ = __at_first;
 bool __matched = false;
 do
 {
 __state& __s = __states.back();
 if (__s.__node_)
 __s.__node_->__exec(__s);
 switch (__s.__do_)
 {
 case __state::__end_state:
 if (!__matched || __highest_j < __s.__current_ - __s.__first_)
 __highest_j = __s.__current_ - __s.__first_;
 __matched = true;
 if (__highest_j == _Np)
 __states.clear();
 else
 __states.pop_back();
 break;
 case __state::__consume_input:
 break;
 case __state::__accept_and_consume:
 __states.push_front(_VSTD::move(__s));
 __states.pop_back();
 break;
 case __state::__repeat:
 case __state::__accept_but_not_consume:
 break;
 case __state::__split:
 {
 __state __snext = __s;
 __s.__node_->__exec_split(true, __s);
 __snext.__node_->__exec_split(false, __snext);
 __states.push_back(_VSTD::move(__snext));
 }
 break;
 case __state::__reject:
 __states.pop_back();
 break;
 default:
#ifndef _LIBCPP_NO_EXCEPTIONS
 throw regex_error(regex_constants::__re_err_unknown);
#endif
 break;
 }
 } while (!__states.empty());
 if (__matched)
 {
 __m.__matches_[0].first = __first;
 __m.__matches_[0].second = _VSTD::next(__first, __highest_j);
 __m.__matches_[0].matched = true;
 return true;
 }
 }
 return false;
}

template <class _CharT, class _Traits>
template <class _Allocator>
bool
basic_regex<_CharT, _Traits>::__match_at_start_posix_subs(
 const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool __at_first) const
{
 vector<__state> __states;
 __state __best_state;
 ptrdiff_t __j = 0;
 ptrdiff_t __highest_j = 0;
 ptrdiff_t _Np = _VSTD::distance(__first, __last);
 __node* __st = __start_.get();
 if (__st)
 {
 __states.push_back(__state());
 __states.back().__do_ = 0;
 __states.back().__first_ = __first;
 __states.back().__current_ = __first;
 __states.back().__last_ = __last;
 __states.back().__sub_matches_.resize(mark_count());
 __states.back().__loop_data_.resize(__loop_count());
 __states.back().__node_ = __st;
 __states.back().__flags_ = __flags;
 __states.back().__at_first_ = __at_first;
 const _CharT* __current = __first;
 bool __matched = false;
 do
 {
 __state& __s = __states.back();
 if (__s.__node_)
 __s.__node_->__exec(__s);
 switch (__s.__do_)
 {
 case __state::__end_state:
 if (!__matched || __highest_j < __s.__current_ - __s.__first_)
 {
 __highest_j = __s.__current_ - __s.__first_;
 __best_state = __s;
 }
 __matched = true;
 if (__highest_j == _Np)
 __states.clear();
 else
 __states.pop_back();
 break;
 case __state::__accept_and_consume:
 __j += __s.__current_ - __current;
 __current = __s.__current_;
 break;
 case __state::__repeat:
 case __state::__accept_but_not_consume:
 break;
 case __state::__split:
 {
 __state __snext = __s;
 __s.__node_->__exec_split(true, __s);
 __snext.__node_->__exec_split(false, __snext);
 __states.push_back(_VSTD::move(__snext));
 }
 break;
 case __state::__reject:
 __states.pop_back();
 break;
 default:
#ifndef _LIBCPP_NO_EXCEPTIONS
 throw regex_error(regex_constants::__re_err_unknown);
#endif
 break;
 }
 } while (!__states.empty());
 if (__matched)
 {
 __m.__matches_[0].first = __first;
 __m.__matches_[0].second = _VSTD::next(__first, __highest_j);
 __m.__matches_[0].matched = true;
 for (unsigned __i = 0; __i < __best_state.__sub_matches_.size(); ++__i)
 __m.__matches_[__i+1] = __best_state.__sub_matches_[__i];
 return true;
 }
 }
 return false;
}

template <class _CharT, class _Traits>
template <class _Allocator>
bool
basic_regex<_CharT, _Traits>::__match_at_start(
 const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags, bool __at_first) const
{
 if ((__flags_ & 0x1F0) == ECMAScript)
 return __match_at_start_ecma(__first, __last, __m, __flags, __at_first);
 if (mark_count() == 0)
 return __match_at_start_posix_nosubs(__first, __last, __m, __flags, __at_first);
 return __match_at_start_posix_subs(__first, __last, __m, __flags, __at_first);
}

template <class _CharT, class _Traits>
template <class _Allocator>
bool
basic_regex<_CharT, _Traits>::__search(
 const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 regex_constants::match_flag_type __flags) const
{
 __m.__init(1 + mark_count(), __first, __last,
 __flags & regex_constants::__no_update_pos);
 if (__match_at_start(__first, __last, __m, __flags, 
 !(__flags & regex_constants::__no_update_pos)))
 {
 __m.__prefix_.second = __m[0].first;
 __m.__prefix_.matched = __m.__prefix_.first != __m.__prefix_.second;
 __m.__suffix_.first = __m[0].second;
 __m.__suffix_.matched = __m.__suffix_.first != __m.__suffix_.second;
 return true;
 }
 if (__first != __last && !(__flags & regex_constants::match_continuous))
 {
 __flags |= regex_constants::match_prev_avail;
 for (++__first; __first != __last; ++__first)
 {
 __m.__matches_.assign(__m.size(), __m.__unmatched_);
 if (__match_at_start(__first, __last, __m, __flags, false))
 {
 __m.__prefix_.second = __m[0].first;
 __m.__prefix_.matched = __m.__prefix_.first != __m.__prefix_.second;
 __m.__suffix_.first = __m[0].second;
 __m.__suffix_.matched = __m.__suffix_.first != __m.__suffix_.second;
 return true;
 }
 __m.__matches_.assign(__m.size(), __m.__unmatched_);
 }
 }
 __m.__matches_.clear();
 return false;
}

template <class _BidirectionalIterator, class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(_BidirectionalIterator __first, _BidirectionalIterator __last,
 match_results<_BidirectionalIterator, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 int __offset = (__flags & regex_constants::match_prev_avail) ? 1 : 0;
 basic_string<_CharT> __s(_VSTD::prev(__first, __offset), __last);
 match_results<const _CharT*> __mc;
 bool __r = __e.__search(__s.data() + __offset, __s.data() + __s.size(), __mc, __flags);
 __m.__assign(__first, __last, __mc, __flags & regex_constants::__no_update_pos);
 return __r;
}

template <class _Iter, class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(__wrap_iter<_Iter> __first,
 __wrap_iter<_Iter> __last,
 match_results<__wrap_iter<_Iter>, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 match_results<const _CharT*> __mc;
 bool __r = __e.__search(__first.base(), __last.base(), __mc, __flags);
 __m.__assign(__first, __last, __mc, __flags & regex_constants::__no_update_pos);
 return __r;
}

template <class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(const _CharT* __first, const _CharT* __last,
 match_results<const _CharT*, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 return __e.__search(__first, __last, __m, __flags);
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(_BidirectionalIterator __first, _BidirectionalIterator __last,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 basic_string<_CharT> __s(__first, __last);
 match_results<const _CharT*> __mc;
 return __e.__search(__s.data(), __s.data() + __s.size(), __mc, __flags);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(const _CharT* __first, const _CharT* __last,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 match_results<const _CharT*> __mc;
 return __e.__search(__first, __last, __mc, __flags);
}

template <class _CharT, class _Allocator, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(const _CharT* __str, match_results<const _CharT*, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 return __e.__search(__str, __str + _Traits::length(__str), __m, __flags);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(const _CharT* __str, const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 match_results<const _CharT*> __m;
 return _VSTD::regex_search(__str, __m, __e, __flags);
}

template <class _ST, class _SA, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(const basic_string<_CharT, _ST, _SA>& __s,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 match_results<const _CharT*> __mc;
 return __e.__search(__s.data(), __s.data() + __s.size(), __mc, __flags);
}

template <class _ST, class _SA, class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(const basic_string<_CharT, _ST, _SA>& __s,
 match_results<typename basic_string<_CharT, _ST, _SA>::const_iterator, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 match_results<const _CharT*> __mc;
 bool __r = __e.__search(__s.data(), __s.data() + __s.size(), __mc, __flags);
 __m.__assign(__s.begin(), __s.end(), __mc, __flags & regex_constants::__no_update_pos);
 return __r;
}

#if _LIBCPP_STD_VER > 11
template <class _ST, class _SA, class _Ap, class _Cp, class _Tp>
bool
regex_search(const basic_string<_Cp, _ST, _SA>&& __s,
 match_results<typename basic_string<_Cp, _ST, _SA>::const_iterator, _Ap>&,
 const basic_regex<_Cp, _Tp>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default) = delete; 
#endif

// regex_match

template <class _BidirectionalIterator, class _Allocator, class _CharT, class _Traits>
bool
regex_match(_BidirectionalIterator __first, _BidirectionalIterator __last,
 match_results<_BidirectionalIterator, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 bool __r = _VSTD::regex_search(__first, __last, __m, __e,
 __flags | regex_constants::match_continuous);
 if (__r)
 {
 __r = !__m.suffix().matched;
 if (!__r)
 __m.__matches_.clear();
 }
 return __r;
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_match(_BidirectionalIterator __first, _BidirectionalIterator __last,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 match_results<_BidirectionalIterator> __m;
 return _VSTD::regex_match(__first, __last, __m, __e, __flags);
}

template <class _CharT, class _Allocator, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_match(const _CharT* __str, match_results<const _CharT*, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 return _VSTD::regex_match(__str, __str + _Traits::length(__str), __m, __e, __flags);
}

template <class _ST, class _SA, class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_match(const basic_string<_CharT, _ST, _SA>& __s,
 match_results<typename basic_string<_CharT, _ST, _SA>::const_iterator, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 return _VSTD::regex_match(__s.begin(), __s.end(), __m, __e, __flags);
}

#if _LIBCPP_STD_VER > 11
template <class _ST, class _SA, class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_match(const basic_string<_CharT, _ST, _SA>&& __s,
 match_results<typename basic_string<_CharT, _ST, _SA>::const_iterator, _Allocator>& __m,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default) = delete; 
#endif

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_match(const _CharT* __str, const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 return _VSTD::regex_match(__str, __str + _Traits::length(__str), __e, __flags);
}

template <class _ST, class _SA, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_match(const basic_string<_CharT, _ST, _SA>& __s,
 const basic_regex<_CharT, _Traits>& __e,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 return _VSTD::regex_match(__s.begin(), __s.end(), __e, __flags);
}

// regex_iterator

template <class _BidirectionalIterator,
 class _CharT = typename iterator_traits<_BidirectionalIterator>::value_type,
 class _Traits = regex_traits<_CharT> >
class _LIBCPP_TYPE_VIS_ONLY regex_iterator
{
public:
 typedef basic_regex<_CharT, _Traits> regex_type;
 typedef match_results<_BidirectionalIterator> value_type;
 typedef ptrdiff_t difference_type;
 typedef const value_type* pointer;
 typedef const value_type& reference;
 typedef forward_iterator_tag iterator_category;

private:
 _BidirectionalIterator __begin_;
 _BidirectionalIterator __end_;
 const regex_type* __pregex_;
 regex_constants::match_flag_type __flags_;
 value_type __match_;

public:
 regex_iterator();
 regex_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re,
 regex_constants::match_flag_type __m
 = regex_constants::match_default);
#if _LIBCPP_STD_VER > 11
 regex_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type&& __re,
 regex_constants::match_flag_type __m 
 = regex_constants::match_default) = delete;
#endif

 bool operator==(const regex_iterator& __x) const;
 _LIBCPP_INLINE_VISIBILITY
 bool operator!=(const regex_iterator& __x) const {return !(*this == __x);}

 _LIBCPP_INLINE_VISIBILITY
 reference operator*() const {return __match_;}
 _LIBCPP_INLINE_VISIBILITY
 pointer operator->() const {return &__match_;}

 regex_iterator& operator++();
 _LIBCPP_INLINE_VISIBILITY
 regex_iterator operator++(int)
 {
 regex_iterator __t(*this);
 ++(*this);
 return __t;
 }
};

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_iterator<_BidirectionalIterator, _CharT, _Traits>::regex_iterator()
 : __begin_(), __end_(), __pregex_(nullptr), __flags_(), __match_()
{
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_iterator<_BidirectionalIterator, _CharT, _Traits>::
 regex_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re, regex_constants::match_flag_type __m)
 : __begin_(__a),
 __end_(__b),
 __pregex_(&__re),
 __flags_(__m)
{
 _VSTD::regex_search(__begin_, __end_, __match_, *__pregex_, __flags_);
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
bool
regex_iterator<_BidirectionalIterator, _CharT, _Traits>::
 operator==(const regex_iterator& __x) const
{
 if (__match_.empty() && __x.__match_.empty())
 return true;
 if (__match_.empty() || __x.__match_.empty())
 return false;
 return __begin_ == __x.__begin_ &&
 __end_ == __x.__end_ &&
 __pregex_ == __x.__pregex_ &&
 __flags_ == __x.__flags_ &&
 __match_[0] == __x.__match_[0];
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_iterator<_BidirectionalIterator, _CharT, _Traits>&
regex_iterator<_BidirectionalIterator, _CharT, _Traits>::operator++()
{
 __flags_ |= regex_constants::__no_update_pos;
 _BidirectionalIterator __start = __match_[0].second;
 if (__match_.empty())
 {
 if (__start == __end_)
 {
 __match_ = value_type();
 return *this;
 }
 else if (_VSTD::regex_search(__start, __end_, __match_, *__pregex_,
 __flags_ | regex_constants::match_not_null |
 regex_constants::match_continuous))
 return *this;
 else
 ++__start;
 }
 __flags_ |= regex_constants::match_prev_avail;
 if (!_VSTD::regex_search(__start, __end_, __match_, *__pregex_, __flags_))
 __match_ = value_type();
 return *this;
}

typedef regex_iterator<const char*> cregex_iterator;
typedef regex_iterator<const wchar_t*> wcregex_iterator;
typedef regex_iterator<string::const_iterator> sregex_iterator;
typedef regex_iterator<wstring::const_iterator> wsregex_iterator;

// regex_token_iterator

template <class _BidirectionalIterator,
 class _CharT = typename iterator_traits<_BidirectionalIterator>::value_type,
 class _Traits = regex_traits<_CharT> >
class _LIBCPP_TYPE_VIS_ONLY regex_token_iterator
{
public:
 typedef basic_regex<_CharT, _Traits> regex_type;
 typedef sub_match<_BidirectionalIterator> value_type;
 typedef ptrdiff_t difference_type;
 typedef const value_type* pointer;
 typedef const value_type& reference;
 typedef forward_iterator_tag iterator_category;

private:
 typedef regex_iterator<_BidirectionalIterator, _CharT, _Traits> _Position;

 _Position __position_;
 const value_type* __result_;
 value_type __suffix_;
 ptrdiff_t _N_;
 vector<int> __subs_;

public:
 regex_token_iterator();
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re, int __submatch = 0,
 regex_constants::match_flag_type __m =
 regex_constants::match_default);
#if _LIBCPP_STD_VER > 11
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type&& __re, int __submatch = 0,
 regex_constants::match_flag_type __m =
 regex_constants::match_default) = delete;
#endif

 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re, const vector<int>& __submatches,
 regex_constants::match_flag_type __m =
 regex_constants::match_default);
#if _LIBCPP_STD_VER > 11
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type&& __re, const vector<int>& __submatches,
 regex_constants::match_flag_type __m =
 regex_constants::match_default) = delete;
#endif

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re,
 initializer_list<int> __submatches,
 regex_constants::match_flag_type __m =
 regex_constants::match_default);

#if _LIBCPP_STD_VER > 11
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type&& __re,
 initializer_list<int> __submatches,
 regex_constants::match_flag_type __m =
 regex_constants::match_default) = delete;
#endif
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 template <size_t _Np>
 regex_token_iterator(_BidirectionalIterator __a,
 _BidirectionalIterator __b,
 const regex_type& __re,
 const int (&__submatches)[_Np],
 regex_constants::match_flag_type __m =
 regex_constants::match_default);
#if _LIBCPP_STD_VER > 11
 template <std::size_t _Np>
 regex_token_iterator(_BidirectionalIterator __a,
 _BidirectionalIterator __b,
 const regex_type&& __re,
 const int (&__submatches)[_Np],
 regex_constants::match_flag_type __m =
 regex_constants::match_default) = delete;
#endif

 regex_token_iterator(const regex_token_iterator&);
 regex_token_iterator& operator=(const regex_token_iterator&);

 bool operator==(const regex_token_iterator& __x) const;
 _LIBCPP_INLINE_VISIBILITY
 bool operator!=(const regex_token_iterator& __x) const {return !(*this == __x);}

 _LIBCPP_INLINE_VISIBILITY
 const value_type& operator*() const {return *__result_;}
 _LIBCPP_INLINE_VISIBILITY
 const value_type* operator->() const {return __result_;}

 regex_token_iterator& operator++();
 _LIBCPP_INLINE_VISIBILITY
 regex_token_iterator operator++(int)
 {
 regex_token_iterator __t(*this);
 ++(*this);
 return __t;
 }

private:
 void __init(_BidirectionalIterator __a, _BidirectionalIterator __b);
 void __establish_result () {
 if (__subs_[_N_] == -1)
 __result_ = &__position_->prefix();
 else
 __result_ = &(*__position_)[__subs_[_N_]];
 } 
};

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 regex_token_iterator()
 : __result_(nullptr),
 __suffix_(),
 _N_(0)
{
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
void
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 __init(_BidirectionalIterator __a, _BidirectionalIterator __b)
{
 if (__position_ != _Position())
 __establish_result ();
 else if (__subs_[_N_] == -1)
 {
 __suffix_.matched = true;
 __suffix_.first = __a;
 __suffix_.second = __b;
 __result_ = &__suffix_;
 }
 else
 __result_ = nullptr;
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re, int __submatch,
 regex_constants::match_flag_type __m)
 : __position_(__a, __b, __re, __m),
 _N_(0),
 __subs_(1, __submatch)
{
 __init(__a, __b);
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re, const vector<int>& __submatches,
 regex_constants::match_flag_type __m)
 : __position_(__a, __b, __re, __m),
 _N_(0),
 __subs_(__submatches)
{
 __init(__a, __b);
}

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re,
 initializer_list<int> __submatches,
 regex_constants::match_flag_type __m)
 : __position_(__a, __b, __re, __m),
 _N_(0),
 __subs_(__submatches)
{
 __init(__a, __b);
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _BidirectionalIterator, class _CharT, class _Traits>
template <size_t _Np>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 regex_token_iterator(_BidirectionalIterator __a, _BidirectionalIterator __b,
 const regex_type& __re,
 const int (&__submatches)[_Np],
 regex_constants::match_flag_type __m)
 : __position_(__a, __b, __re, __m),
 _N_(0),
 __subs_(__submatches, __submatches + _Np)
{
 __init(__a, __b);
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 regex_token_iterator(const regex_token_iterator& __x)
 : __position_(__x.__position_),
 __result_(__x.__result_),
 __suffix_(__x.__suffix_),
 _N_(__x._N_),
 __subs_(__x.__subs_)
{
 if (__x.__result_ == &__x.__suffix_)
 __result_ = &__suffix_;
 else if ( __result_ != nullptr )
 __establish_result ();
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>&
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 operator=(const regex_token_iterator& __x)
{
 if (this != &__x)
 {
 __position_ = __x.__position_;
 if (__x.__result_ == &__x.__suffix_)
 __result_ = &__suffix_;
 else
 __result_ = __x.__result_;
 __suffix_ = __x.__suffix_;
 _N_ = __x._N_;
 __subs_ = __x.__subs_;

 if ( __result_ != nullptr && __result_ != &__suffix_ )
 __establish_result();
 }
 return *this;
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
bool
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
 operator==(const regex_token_iterator& __x) const
{
 if (__result_ == nullptr && __x.__result_ == nullptr)
 return true;
 if (__result_ == &__suffix_ && __x.__result_ == &__x.__suffix_ &&
 __suffix_ == __x.__suffix_)
 return true;
 if (__result_ == nullptr || __x.__result_ == nullptr)
 return false;
 if (__result_ == &__suffix_ || __x.__result_ == &__x.__suffix_)
 return false;
 return __position_ == __x.__position_ && _N_ == __x._N_ &&
 __subs_ == __x.__subs_;
}

template <class _BidirectionalIterator, class _CharT, class _Traits>
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>&
regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::operator++()
{
 _Position __prev = __position_;
 if (__result_ == &__suffix_)
 __result_ = nullptr;
 else if (_N_ + 1 < __subs_.size())
 {
 ++_N_;
 __establish_result();
 }
 else
 {
 _N_ = 0;
 ++__position_;
 if (__position_ != _Position())
 __establish_result();
 else
 {
 if (_VSTD::find(__subs_.begin(), __subs_.end(), -1) != __subs_.end()
 && __prev->suffix().length() != 0)
 {
 __suffix_.matched = true;
 __suffix_.first = __prev->suffix().first;
 __suffix_.second = __prev->suffix().second;
 __result_ = &__suffix_;
 }
 else
 __result_ = nullptr;
 }
 }
 return *this;
}

typedef regex_token_iterator<const char*> cregex_token_iterator;
typedef regex_token_iterator<const wchar_t*> wcregex_token_iterator;
typedef regex_token_iterator<string::const_iterator> sregex_token_iterator;
typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator;

// regex_replace

template <class _OutputIterator, class _BidirectionalIterator,
 class _Traits, class _CharT>
_OutputIterator
regex_replace(_OutputIterator __out,
 _BidirectionalIterator __first, _BidirectionalIterator __last,
 const basic_regex<_CharT, _Traits>& __e, const _CharT* __fmt,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 typedef regex_iterator<_BidirectionalIterator, _CharT, _Traits> _Iter;
 _Iter __i(__first, __last, __e, __flags);
 _Iter __eof;
 if (__i == __eof)
 {
 if (!(__flags & regex_constants::format_no_copy))
 __out = _VSTD::copy(__first, __last, __out);
 }
 else
 {
 sub_match<_BidirectionalIterator> __lm;
 for (size_t __len = char_traits<_CharT>::length(__fmt); __i != __eof; ++__i)
 {
 if (!(__flags & regex_constants::format_no_copy))
 __out = _VSTD::copy(__i->prefix().first, __i->prefix().second, __out);
 __out = __i->format(__out, __fmt, __fmt + __len, __flags);
 __lm = __i->suffix();
 if (__flags & regex_constants::format_first_only)
 break;
 }
 if (!(__flags & regex_constants::format_no_copy))
 __out = _VSTD::copy(__lm.first, __lm.second, __out);
 }
 return __out;
}

template <class _OutputIterator, class _BidirectionalIterator,
 class _Traits, class _CharT, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
_OutputIterator
regex_replace(_OutputIterator __out,
 _BidirectionalIterator __first, _BidirectionalIterator __last,
 const basic_regex<_CharT, _Traits>& __e,
 const basic_string<_CharT, _ST, _SA>& __fmt,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 return _VSTD::regex_replace(__out, __first, __last, __e, __fmt.c_str(), __flags);
}

template <class _Traits, class _CharT, class _ST, class _SA, class _FST,
 class _FSA>
inline _LIBCPP_INLINE_VISIBILITY
basic_string<_CharT, _ST, _SA>
regex_replace(const basic_string<_CharT, _ST, _SA>& __s,
 const basic_regex<_CharT, _Traits>& __e,
 const basic_string<_CharT, _FST, _FSA>& __fmt,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 basic_string<_CharT, _ST, _SA> __r;
 _VSTD::regex_replace(back_inserter(__r), __s.begin(), __s.end(), __e,
 __fmt.c_str(), __flags);
 return __r;
}

template <class _Traits, class _CharT, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
basic_string<_CharT, _ST, _SA>
regex_replace(const basic_string<_CharT, _ST, _SA>& __s,
 const basic_regex<_CharT, _Traits>& __e, const _CharT* __fmt,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 basic_string<_CharT, _ST, _SA> __r;
 _VSTD::regex_replace(back_inserter(__r), __s.begin(), __s.end(), __e,
 __fmt, __flags);
 return __r;
}

template <class _Traits, class _CharT, class _ST, class _SA>
inline _LIBCPP_INLINE_VISIBILITY
basic_string<_CharT>
regex_replace(const _CharT* __s,
 const basic_regex<_CharT, _Traits>& __e,
 const basic_string<_CharT, _ST, _SA>& __fmt,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 basic_string<_CharT> __r;
 _VSTD::regex_replace(back_inserter(__r), __s,
 __s + char_traits<_CharT>::length(__s), __e,
 __fmt.c_str(), __flags);
 return __r;
}

template <class _Traits, class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
basic_string<_CharT>
regex_replace(const _CharT* __s,
 const basic_regex<_CharT, _Traits>& __e,
 const _CharT* __fmt,
 regex_constants::match_flag_type __flags = regex_constants::match_default)
{
 basic_string<_CharT> __r;
 _VSTD::regex_replace(back_inserter(__r), __s,
 __s + char_traits<_CharT>::length(__s), __e,
 __fmt, __flags);
 return __r;
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_REGEX