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std::match_results::str(3) C++ Standard Libary std::match_results::str(3) NAME std::match_results::str - std::match_results::str Synopsis string_type str( size_type n = 0 ) const; (since C++11) Returns a string representing the indicated sub-match. If n == 0, a string representing entire matched expression is re- turned. If n > 0 && n < size(), a string representing nth sub-match is re- turned. if n >= size(), a string representing the unmatched match is re- turned. The call is equivalent to string_type((*this)[n]); Parameters n - integral number specifying which match to return Return value Returns a string representing the specified match or sub match. Example // Run this code #include <iostream> #include <regex> #include <string> int main() { std::string target("baaaby"); std::smatch sm; std::regex re1("a(a)*b"); std::regex_search(target, sm, re1); std::cout << "entire match: " << sm.str(0) << '\n' << "submatch #1: " << sm.str(1) << '\n'; std::regex re2("a(a*)b"); std::regex_search(target, sm, re2); std::cout << "entire match: " << sm.str(0) << '\n' << "submatch #1: " << sm.str(1) << '\n'; } Output: entire match: aaab submatch #1: a entire match: aaab submatch #1: aa See also operator[] returns specified sub-match (public member function) http://cppreference.com 2022.07.31 std::match_results::str(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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