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# Java Examples - Searching Duplicate Words

## Problem Description:

How to match duplicate words in a regular expression?

## Solution:

Following example shows how to search duplicate words in a regular expression by using p.matcher() method and m.group() method of regex.Matcher class.

    import java.util.regex.Matcher;
    import java.util.regex.Pattern;

    public class Main {
       public static void main(String args[])
       throws Exception {
          String duplicatePattern = "\\b(\\w+) \\1\\b";
          Pattern p = Pattern.compile(duplicatePattern);
          int matches = 0;
          String phrase = " this is a test ";
          Matcher m = p.matcher(phrase);
          String val = null;
          while (m.find()) {
             val = ":" + m.group() + ":";
             matches++;
          }
          if(val>0)
             System.out.println("The string
             has matched with the pattern.");
          else
          System.out.println("The string
          has not matched with the pattern.");
       }
    }

## Result:

The above code sample will produce the following result.

    The string has matched with the pattern.

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