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

NAME
     std::match_results::prefix - std::match_results::prefix

Synopsis
	const_reference prefix() const;  (since C++11)

	Obtains a reference to the std::sub_match object representing the target
     sequence
	between  the start of the beginning of the target sequence and the start
     of the
	entire match of the regular expression.

	The behavior is undefined unless ready() == true.

Parameters
	(none)

Return value
	Reference to the unmatched prefix.

Example
     // Run this code

      #include <iostream>
      #include <regex>
      #include <string>

      int main()
      {
	  std::regex re("a(a)*b");
	  std::string target("baaaby");
	  std::smatch sm;

	  std::regex_search(target, sm, re);
	  std::cout << sm.prefix().str() << '\n';
      }

Output:
      b

See also
	       returns sub-sequence between the end of the full  match	and  the
     end of the
	suffix target sequence
	       (public member function)

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