std::match_results::position
From cppreference.com
< cpplrm; | regexlrm; | match results
| 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 expression is returned.
If n > 0 && n < size(), the position of the first character of the nth 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:
1
See also
| returns specified sub-match (public member function) |