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std::match_...s::position(3)  C++ Standard Libary std::match_...s::position(3)

NAME
       std::match_results::position - std::match_results::position

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

	  Returns  the	position  of the first character of the	specified sub-
       match.

	  If n == 0, the position of the first character of the	entire matched
       expression is
	  returned.

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

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

Parameters
	  n - integral number specifying which match to	examine

Return value
	  The position of the first character of the specified match  or  sub-
       match.

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::regex_match(target, sm, re);
	    std::cout << sm.position(1)	<< '\n';
	}

Output:
	1

See also
	  operator[] returns specified sub-match
		     (public member function)

http://cppreference.com		  2022.07.31	  std::match_...s::position(3)

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