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match_results prefix() and suffix() in C++
In this article we will be discussing the working, syntax and examples of match_results::prefix() and match_results::suffix() functions 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:: prefix()?
match_results::prefix() function is an inbuilt function in C++ STL, which is defined in <regex> header file. prefix() is used to get the preceding match_results of the object associated with the function. This function returns the reference of the succeeding sequence of the match_results object.
Syntax
match_results.prefix();
Parameters
This function accepts no parameter.
Return value
This function returns constant reference of the string or sequence preceding the match sequence.
Example
Input: string str = "Tutorials Points";
regex R("Points");
smatch Mat;
regex_search(str, Mat, R);
Mat.prefix();
Output: Tutorials
prefix()
Example
#include <bits/stdc++.h>
using namespace std;
int main() {
string str = "Tutorials Points";
regex R("Points");
smatch Mat;
regex_search(str, Mat, R);
cout<<"String prefix is : ";
if (!Mat.empty()) {
cout << Mat.prefix();
}
return 0;
}
Output
If we run the above code it will generate the following output −
String prefix is : Tutorials
What is match_results:: suffix()?
match_results::suffix() function is an inbuilt function in C++ STL, which is defined in <regex> header file. suffix() is used to get the succeeding match_results of the object associated with the function. This function returns the reference of the succeeding sequence of the match_results object.
Syntax
match_results.suffix();
Parameters
This function accepts no parameter.
Return value
This function returns constant reference of the string or sequence succeeding the match sequence.
Example
Input: std::string str("Tutorials Points is the best");
std::smatch Mat;
std::regex re("Points");
std::regex_match ( str, Mat, re );
Mat.suffix();
Output: is the best
suffix()
Example
#include <bits/stdc++.h>
using namespace std;
int main() {
string str = "Tutorials Points is the best";
regex R("Points");
smatch Mat;
regex_search(str, Mat, R);
cout<<"String prefix is : ";
if (!Mat.empty()) {
cout << Mat.suffix();
}
return 0;
}
Output
If we run the above code it will generate the following output −
String prefix is : is the best
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