[libcxx] Add "flag" default arg: basic_regex ptr_size_flag ctor Summary: The synopsis in C++11 subclause 28.8 [re.regex] has: ``` basic_regex(const charT* p, size_t len, flag_type f = regex_constants::ECMAScript); ``` The default argument is added to libc++ by this change. Reviewers: mclow.lists, rsmith, hubert.reinterpretcast Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D22702 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@277966 91177308-0d34-0410-b5e6-96231b3b80d8
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