std::match_...s::position(3) C++ Standard Libary std::match_...s::position(3) NAME std::match_results::position - std::match_results::position Synopsis difference_type position( size_type n = 0 ) const; (since C++11) Returns the position of the first character of the specified sub-match. If n == 0, the position of the first character of the entire matched ex- pression is returned. If n > 0 && n < size(), the position of the first character of the n^th sub-match is returned. if n >= size(), a position of the first character of the unmatched match is returned. Parameters n - integral number specifying which match to examine Return value The position of the first character of the specified match or sub-match. Example // Run this code #include <iostream> #include <regex> #include <string> int main() { std::regex re("a(a)*b"); std::string target("aaab"); std::smatch sm; std::regex_match(target, sm, re); std::cout << sm.position(1) << '\n'; } Output: 2 See also operator[] returns specified sub-match (public member function) http://cppreference.com 2024.06.10 std::match_...s::position(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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