std::match_results::size
From cppreference.com
< cpplrm; | regexlrm; | match results
| 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
| returns iterator to the beginning of the list of sub-matches (public member function) | |
| returns iterator to the end of the list of sub-matches (public member function) |