std::match_results<BidirIt,Alloc>::size (3) - Linux Manuals

std::match_results<BidirIt,Alloc>::size: std::match_results<BidirIt,Alloc>::size

NAME

std::match_results<BidirIt,Alloc>::size - std::match_results<BidirIt,Alloc>::size

Synopsis


size_type size() const noexcept; (since C++11)


Returns the number of submatches, i.e. std::distance(begin(), end()).
Returns 0 if *this does not represent the result of a successful match.

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
begin (public member function)
cbegin
       returns iterator to the end of the list of sub-matches
end (public member function)
cend

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