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std::sub_match::length(3)     C++ Standard Libary    std::sub_match::length(3)

NAME
       std::sub_match::length -	std::sub_match::length

Synopsis
	  difference_type length() const;

Parameters
	  (none)

Return value
	  Returns  the	number	of  characters	in  the	 match,	i.e. std::dis-
       tance(first, second) if
	  the match is valid, 0	otherwise.

Complexity
	  Constant.

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

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