C++ Regular Expression Example

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A regular expression (sometimes abbreviated to “regex”) is a way for a computer user or programmer to express how a computer program should look for a specified pattern in text and then what the program is to do when each pattern match is found. For example, a regular expression could tell a program to search for all text lines that contain the word “Windows 95” and then to print out each line in which a match is found or substitute another text sequence (for example, just “Windows”) where any match occurs (http://searchsoftwarequality.techtarget.com/, 2010).

Let’s take a look at some examples:

regex_match() is a function that returns true if the regular expression matches the given string. In other cases, f it returns false.

#include <iostream>
#include <regex>

using namespace std;
int main()
{
	string a = "man, woman";

	regex b("(man)(.*)"); // "man" followed by any character

						   
	if (regex_match(a, b))
		cout << "'a' is a match of the regular expression 'b' \n";

	
	if ((a.begin(), a.end(), b))
		cout << "'a' is a match of the regular expression 'b' in the range from 0 to string end\n";

	return 0;
}

Output:

a is a match of the regular expression b

a is a match of the regular expression b in the range from 0 to string end

rexeg_search() is a function which is used to search for a pattern that will match with the regular expression.

#include <iostream>
#include <regex>
#include<string.h>
using namespace std;

int main()
{
	string a = "I am looking for newspaper "
		"articles";

	regex b("news [a-zA-Z]+");

	smatch s;

	regex_search(a, b, s);

	for (auto z : s)
		cout << z << " ";

	return 0;
}

Output:

newspaper

regex_replace() is a function which is used to delete the pattern which is a match to the regular expression with a string.

#include <iostream>
#include <string>
#include <regex>
#include <iterator>
using namespace std;

int main()
{
	string s = "I am looking for newspaper \n";

	regex r("news[a-zA-z]+");

	cout << std::regex_replace(s, r, "something");

	string result;

	regex_replace(back_inserter(result), s.begin(), s.end(),
		r, "something");

	cout << result;

	return 0;
}

Output:

I am looking for something
I am looking for something

Thanks for your attention!

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