Match Duplicate Words : Pattern « Regular Expressions « Java

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Java » Regular Expressions » PatternScreenshots 
Match Duplicate Words
 

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() ":";
      System.out.println(val);
      matches++;
    }
  }
}

   
  
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14. Setting Case Sensitivity in a Regular Expression
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20. Use an inline modifier: x)a \\s b
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22. Tabs and newlines in the pattern are ignored as well
23. Compiling a Pattern with Multiple Flags
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28. Matcher.reset(CharSequence)
29. Matcher.start(): Find the starting point
30. Matcher.start(int) Example
31. Matcher.end(): find the end point
32. Find the end point of the second 'test'
33. Using the find() Method from Matcher
34. Using the find(int) Method
35. Using the lookingAt Method
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37. Simple Positive Lookahead
38. Finding Every Occurrence of the Letter A
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40. Simple Positive Lookbehind
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43. Implement a pattern matcher for regular expressions
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