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Positive outlook on exclamation mark

I am trying to create a Java regex to match " .jar!

"

The catch is that I don't want the helper to use an exclamation mark. I tried using Pattern.compile("\\.jar(?=!)")

it but it failed. As well as running over an exclamation point.

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

UPDATE : I feel like an idiot, it Pattern.compile("\\.jar(?=!)")

works. I have used Matcher.matches () instead of Matcher.find ().

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2 answers


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!)

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Alternatively, you can try boxing it

Pattern.compile("\\.jar(?=[!])")

Java must be broken: Perl

use strict;
use warnings;


my @data = qw( .jar .jar! .jarx .jarx! );


my @patterns = (
  "\\.jar(?=!)",
  "\\.jar(?=\\!)",
  "\\.jar(?=[!])",
);


for my $pat ( @patterns ){
  for my $inp ( @data ) {
    if ( $inp =~ /$pat/ ) {
      print "$inp =~ $pat \n";
    }
  }
}


-> 

.jar! =~ \.jar(?=!) 
.jar! =~ \.jar(?=\!) 
.jar! =~ \.jar(?=[!])

sub>

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