match_results operator= in C++

In this article we will be discussing the working, syntax and examples of match_results operator ‘=’ in C++ STL.

What is a match_results in C++ STL?

std::match_results is a specialized container-like class which is used to hold the collection of character sequences which are matched. In this container class a regex match operation finds the matches of the target sequence.

What is match_results operator ‘=’

Match_results operator = is an equality operator which is used to assign the value to a match_results. Operator = is used to copy or move the elements from one match_results object to another.

Syntax

match_results1 = (match_results2);

Parameters

Another match_results object whose data we have to copy to a match_results object.

Return value

This returns nothing.

Example

Input: string str = "Tutorials Point";    regex R("(Tutorials)(.*)");    smatch Mat_1, Mat_2;    regex_match(str, Mat_1, R);    Mat_2 = Mat_1; Output: MAT 2 =    Tutorials Point    Tutorials    Point

Example

 Live Demo

#include <bits/stdc++.h> using namespace std; int main() {    string str = "Tutorials Point";    regex R("(Tutorials)(.*)");    smatch Mat_1, Mat_2;    regex_match(str, Mat_1, R);    Mat_2 = Mat_1;    cout<<"String matches: " << endl;    for (smatch::iterator i = Mat_2.begin(); i!= Mat_2.end(); i++) {       cout << *i << endl;    } }

Output

If we run the above code it will generate the following output −

String matches: Tutorials Point Tutorials Point

Example

 Live Demo

#include <bits/stdc++.h> using namespace std; int main() {    string str = "Tutorials Point";    regex R_1("(Tutorials)(.*)");    regex R_2("(Po)(int)(.*)");    smatch Mat_1, Mat_2;    regex_match(str, Mat_1, R_1);    regex_match(str, Mat_2, R_2);    smatch Mat;    if (Mat_1.size() > Mat_2.size()) {       Mat = Mat_1;    } else {       Mat = Mat_2;    }    cout<<"string matches " << endl;    for (smatch::iterator i = Mat.begin(); i!= Mat.end(); i++) {       cout << *i << endl;    } }

Output

If we run the above code it will generate the following output −

String matches: Tutorials Point Tutorials Point