java.util.regex.Matcher in java?

Question

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

Vulpes · 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.. :)