std::match_results<BidirIt,Alloc>::str
From cppreference.com
< cpp | regex | match results
| 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 returned.
If n > 0 && n < size(), a string representing nth sub-match is returned.
if n >= size(), a string representing the unmatched match is returned.
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
| returns specified sub-match (public member function) |