MatchDuplicateWords.java Source code

Introduction

Here is the source code for MatchDuplicateWords.java

Source

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

public class MatchDuplicateWords {
    public static void main(String args[]) {

        hasDuplicate("pizza pizza");
        hasDuplicate("Faster pussycat kill kill");
        hasDuplicate("The mayor of of simpleton");
        hasDuplicate("Never Never Never Never Never");
        hasDuplicate("222 2222");
        hasDuplicate("sara sarah");
        hasDuplicate("Faster pussycat kill, kill");
        hasDuplicate(". .");
    }

    public static boolean hasDuplicate(String phrase) {
        boolean retval = false;
        String duplicatePattern = "\\b(\\w+) \\1\\b";
        Pattern p = null;
        try {
            p = Pattern.compile(duplicatePattern);
        } catch (PatternSyntaxException pex) {
            pex.printStackTrace();
            System.exit(0);
        }
        int matches = 0;
        Matcher m = p.matcher(phrase);
        String val = null;

        while (m.find()) {
            retval = true;
            val = ":" + m.group() + ":";
            System.out.println(val);
            matches++;
        }

        String msg = "   NO MATCH: pattern:" + phrase + "\r\n             regex: " + duplicatePattern;

        if (retval) {
            msg = " MATCH     : pattern:" + phrase + "\r\n         regex: " + duplicatePattern;
        }

        System.out.println(msg + "\r\n");
        return retval;
    }
}