size_type size() const; | (since C++11) |
Returns the number of submatches, i.e. std::distance(begin(), end())
.
Parameters
(none).
Return value
The number of submatches.
Exceptions
noexcept
specification: noexcept
Complexity
Constant.
See also
Example
#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.size() << '\n'; }
Output:
2
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