std::match_results::operator[]
From cppreference.com
< cpp | regex | match results
const_reference operator[]( size_type n ) const;
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(since C++11) | |
Returns an indicated sub-match.
If n == 0, entire matched expression is returned.
If n > 0 && n < size(), nth sub-match is returned.
if n >= size(), a sub-match representing the unmatched match is returned.
Contents |
[edit] Parameters
n | - | integral number specifying which match to return |
[edit] Return value
Returns a sub-match representing the specified match or sub match.
[edit] 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[0] << '\n' << "submatch #1: " << sm[1] << '\n'; std::regex re2("a(a*)b"); std::regex_search(target, sm, re2); std::cout << "entire match: " << sm[0] << '\n' << "submatch #1: " << sm[1] << '\n'; }
Output:
entire match: aaab submatch #1: a entire match: aaab submatch #1: aa
[edit] See also
returns the sequence of characters for the particular sub-match (public member function) |