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]);
| n | - | integral number specifying which match to return |
Returns a string representing the specified match or sub match.
#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
| returns specified sub-match (public member function) |
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