Finding Duplicate Words

package example.validation;
 
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;
    }
}