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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
#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
#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
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