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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.
[code language=”cpp”]
#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;
}
[/code]
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.
[code language=”cpp”]
#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;
}
[/code]
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.
[code language=”cpp”]
#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;
}
[/code]
Output:
I am looking for something I am looking for something
Thanks for your attention!