c++ - Regex match digits between strings

C++ - Regex match digits between strings

If you want to use regular expressions in C++ to match digits between two strings, you can use the <regex> header, which provides the std::regex class. Here's an example:

#include <iostream> #include <regex> int main() { std::string input = "abc123def456ghi"; std::string pattern = "abc(\\d+)def"; std::regex regexPattern(pattern); std::smatch match; if (std::regex_search(input, match, regexPattern)) { if (match.size() > 1) { std::string digits = match[1].str(); std::cout << "Digits between 'abc' and 'def': " << digits << std::endl; } else { std::cout << "No digits found between 'abc' and 'def'" << std::endl; } } else { std::cout << "Pattern not found in the input string" << std::endl; } return 0; }

In this example, the regular expression pattern is set to "abc(\\d+)def", which looks for the substring "abc" followed by one or more digits (captured using parentheses) and then followed by "def". The \\d+ part of the pattern matches one or more digits.

The std::regex_search function is used to search for the pattern in the input string. If a match is found, the captured digits are accessed through the match object.

Adjust the input string and the pattern according to your specific use case.

Examples

  1. "C++ Regex match digits between two strings"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "start123end"; std::regex pattern("start(\\d+)end"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Digits between strings: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Uses a regex pattern to match digits between the strings "start" and "end" in the input string.

  2. "C++ Regex capture numbers between strings"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "prefix456suffix"; std::regex pattern("prefix(\\d+)suffix"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Captured numbers: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Captures and prints the numbers between the strings "prefix" and "suffix" using a regex pattern.

  3. "C++ Regex extract digits between strings"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "begin789end"; std::regex pattern("begin(\\d+)end"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Extracted digits: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Extracts and prints the digits between the strings "begin" and "end" using a regex pattern.

  4. "C++ Regex match numbers inside parentheses"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "(123)"; std::regex pattern("\\((\\d+)\\)"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Numbers inside parentheses: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Matches and prints the numbers inside parentheses using a regex pattern.

  5. "C++ Regex find digits between quotes"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "text '456' more text"; std::regex pattern("'(\\d+)'"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Digits between quotes: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Finds and prints the digits between single quotes in the input string using a regex pattern.

  6. "C++ Regex match numeric values between delimiters"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "data:123:456:data"; std::regex pattern(":(\\d+):"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Numeric values between colons: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Matches and prints numeric values between colons in the input string using a regex pattern.

  7. "C++ Regex capture digits inside curly braces"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "{789}"; std::regex pattern("\\{(\\d+)\\}"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Captured digits inside curly braces: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Captures and prints the digits inside curly braces using a regex pattern.

  8. "C++ Regex extract numbers between square brackets"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "[987]"; std::regex pattern("\\[(\\d+)\\]"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Extracted numbers between square brackets: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Extracts and prints the numbers between square brackets using a regex pattern.

  9. "C++ Regex match integers between angle brackets"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "<123>"; std::regex pattern("<(\\d+)>"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Integers between angle brackets: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Matches and prints integers between angle brackets using a regex pattern.

  10. "C++ Regex find numbers between underscores"

    Code Implementation:

    #include <iostream> #include <regex> #include <string> int main() { std::string input = "_567_"; std::regex pattern("_(\\d+)_"); std::smatch match; if (std::regex_search(input, match, pattern)) { std::cout << "Numbers between underscores: " << match[1].str() << std::endl; } else { std::cout << "No match found" << std::endl; } return 0; }

    Description: Finds and prints numbers between underscores using a regex pattern.

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