std::regex_match, std::regex_replace() | Regex (Regular Expression) In C++

Regex is the short form for “Regular expression”, which is often used in this way in programming languages and many different libraries. It is supported in C++11 onward compilers.
Function Templates used in regex

regex_match() -This function return true if the regular expression is a match against the given string otherwise it returns false.

String 'a' matches regular expression 'b' 
String 'a' matches with regular expression 'b' in the range from 0 to string end

regex_search() - This function is used to search for a pattern matching the regular expression 

GeeksForGeeks 

regex_replace() This function is used to replace the pattern matching to the regular expression with a string.

I am looking for geek 
I am looking for geek 

So Regex operations make use of following parameters :

• Target sequence (subject) – The string to be matched.
• Regular Expression (Pattern) – The regular expression for the target sequence.
• Matched Array – The information about matches is stored in a special match_result array.
• Replacement String – These string are used for allowing replacement of the matches.