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std::match_results::length(3) C++ Standard Libarystd::match_results::length(3)

NAME
       std::match_results::length - std::match_results::length

Synopsis
	  difference_type length( size_type n =	0 ) const;  (since C++11)

	  Returns the length of	the specified sub-match.

	  If n == 0, the length	of the entire matched expression is returned.

	  If n > 0 && n	< size(), the length of	nth sub-match is returned.

	  if n >= size(), a length of the unmatched match is returned.

	  The call is equivalent to (*this)[n].length().

Parameters
	  n - integral number specifying which match to	examine

Return value
	  The length of	the specified match or sub-match.

See also
	  operator[] returns specified sub-match
		     (public member function)
	  length     returns the length	of the match (if any)
		     (public member function of	std::sub_match<BidirIt>)

http://cppreference.com		  2022.07.31	 std::match_results::length(3)

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