Question

I’m trying to build a Java regular expression to match ‘.jar!‘

The catch is that I don’t want the matcher to consume the exclamation mark. I tried using Pattern.compile('\\.jar(?=!)') but that failed. As did escaping the exclamation mark.

Can anyone get this to work or is this a JDK bug?

UPDATE: I feel like an idiot, Pattern.compile('\\.jar(?=!)') does work. I was using Matcher.matches() instead of Matcher.find().

Answer 1

Using your regex works for me (using Sun JDK 1.6.0_02 for Linux):

import java.util.regex.*;  public class Regex {         private static final String text = '.jar!';          private static final String regex = '\\.jar(?=!)';          public static void main(String[] args) {                 Pattern pat = Pattern.compile(regex, Pattern.DOTALL);                 Matcher matcher = pat.matcher(text);                 if (matcher.find()) {                         System.out.println('Match: ' + matcher.group());                 } else {                         System.out.println('No match.');                 }         } } 

prints:

Match: .jar 

(without the !)