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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;
}
}
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