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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_regex.htm below:

C++ Regex Library - regex

C++ Regex Library - regex Previous Quiz Next Description

It is an instantiation of the basic_regex class template for characters of type char.

Declaration

Following is the declaration for std::regex.

typedef basic_regex<char> regex;

C++11

typedef basic_regex<char> regex;

C++14

typedef basic_regex<char> regex;

This class are those described for basic_regex, but using char as its first template parameter (charT), and the corresponding regex_traits<char> as its second template parameter (traits).

regex.htm

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