java.util.regex.Matcher in java?

Question

java.util.regex.Matcher in java?Explain with example.

Vulpes · Accepted Answer

The Matcher class works in coordination with the Pattern class in Java regular expressions.
Having used the Pattern class to define a regular expression, the Matcher class is then used to match the pattern against some text.
The Matcher class doesn't have a constructor. Instead you create a Matcher object by calling the static Pattern.matcher() method.
The Matcher class has various methods including matches, find, group, start and end.
The following example illustrates the use of these methods:
// Regular3.java
import java.util.regex.*;
class Regular3 {    public static void main(String[] args)    {        String text = "There's many a slip twixt cup and lip";        //  look for the substring cup
Pattern pat = Pattern.compile("cup");         Matcher mat = pat.matcher(text);        boolean found = mat.matches();
if(found)        {          System.out.println("Text is a complete match for 'cup'");        }        else        {           System.out.println("Text is not a complete match for 'cup'");        }
while(mat.find())        {           System.out.println("'" + mat.group() + "' found between index " + mat.start() + " and " + (mat.end()-1));        }    } }
The output is:
Text is not a complete match for 'cup' 'cup' found between index 26 and 28

Abhijeet Singh · Answer

Thank You sir.. :)