Question

Write a program in c++ that takes two parameters Regular expression and String. And it check whether string generated by that regular expression.

Answer 1

C++ program to check whether string generated by that regular expression

regex_match() -Regular expression matches with string -returns true

                           if not,return false

#include <iostream>  

#include <regex>  //header file for regex_match() function

using namespace std;  

//driver function

int main()  

{  

string c = "brainly";  

        // Here d is an object of regex (regular expression)  

regex d("(brain)(.*)"); /* regular expression -brain followed by any character  */

      // regex_match function matches string a against regex b  

if ( regex_match(c, d) )  

 cout << "String 'c' matches regular expression 'd' \n";  

         return 0;  

}  

Output

String 'c' matches regular expression 'd'

If string is matched with the regular expression ,we can say that string can be generated by the regular expression.