std::match_results<BidirIt,Alloc>::size
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< cpp | regex | match results
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std::match_results
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match_results::size | ||||
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size_type size() const noexcept; |
(since C++11) | |
Returns the number of submatches, i.e. std::distance (begin( ), end( ) )
Returns 0 if *this
Parameters
(none)
Return value
The number of submatches.
Complexity
Constant.
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::cout << sm.size() << '\n'; std::regex_match(target, sm, re); std::cout << sm.size() << '\n'; }
Output:
0 2
See also
| returns iterator to the beginning of the list of sub-matches (public member function) |
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| returns iterator to the end of the list of sub-matches (public member function) |