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

NAME
       std::regex_traits::length - std::regex_traits::length

Synopsis
	  static std::size_t length(const char_type* p);

	  Calculates  the length of a null-terminated character	sequence, that
       is, the smallest
	  i such that p[i]==0.

	  Standard library specializations of std::regex_traits	execute
	  std::char_traits<CharT>::length(p);

Parameters
	  p - pointer to the first element of  the  null-terminated  character
       sequence

Return value
	  The length of	the null-terminated character string.

Example
       // Run this code

	#include <regex>
	#include <iostream>

	int main()
	{
	    std::cout << std::regex_traits<char>::length(u8"") << '\n'
		      << std::regex_traits<wchar_t>::length(L"") << '\n';
	}

Output:
	10
	5

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

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<https://man.freebsd.org/cgi/man.cgi?query=std::regex_traits::length&sektion=3&manpath=FreeBSD+Ports+15.0>

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