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std::match_results::size(3) C++ Standard Libary std::match_results::size(3) NAME std::match_results::size - std::match_results::size Synopsis size_type size() const noexcept; (since C++11) Returns the number of submatches, i.e. std::distance(begin(), end()). Returns 0 if *this does not represent the result of a successful match. Parameters (none) Return value The number of submatches Complexity Constant 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::cout << sm.size() << '\n'; std::regex_match(target, sm, re); std::cout << sm.size() << '\n'; } Output: 0 2 See also begin returns iterator to the beginning of the list of sub-matches cbegin (public member function) end returns iterator to the end of the list of sub-matches cend (public member function) http://cppreference.com 2022.07.31 std::match_results::size(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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