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std::match_results::size(3)    C++ Standard Libary   std::match_results::size(3)

NAME
     std::match_results::size - std::match_results::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
	begin  returns iterator to the beginning of the list of sub-matches
	cbegin (public member function)
	end    returns iterator to the end of the list of sub-matches
	cend   (public member function)

http://cppreference.com 	   2024.06.10	     std::match_results::size(3)
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