613885 - RegExp pattern matching behaves different in FF4 than FF3

Status: RESOLVED DUPLICATE of bug 599854

(Core :: JavaScript Engine, defect)

Description

[Thomas Bachem]

User-Agent:       Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b7) Gecko/20100101 Firefox/4.0b7
Build Identifier: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b7) Gecko/20100101 Firefox/4.0b7

The below RegExp included in the Dojo Toolkit (dojox.html.set() method) works in FF3.6 and all other browsers but fails to match correctly in FF4b7.

Reproducible: Always

Steps to Reproduce:
/<script\s*(?![^>]*type=['"]?(?:dojo\/|text\/html\b))(?:[^>]*?(?:src=(['"]?)([^>]*?)\1[^>]*)?)*>([\s\S]*?)<\/script>/gi.exec('<script type="text/javascript" src="..."></script>');
Actual Results:  
["<script type="text/javascript" src="..."></script>", undefined, undefined, ""]

Expected Results:  
["<script type="text/javascript" src="..."></script>", """, "...", ""]

It works if I remove an unneeded (?:...)* expression as a workaround:

/<script\s*(?![^>]*type=['"]?(?:dojo\/|text\/html\b))[^>]*?(?:src=(['"]?)([^>]*?)\1[^>]*)?>([\s\S]*?)<\/script>/gi.exec('<script type="text/javascript" src="..."></script>');

Comment 1

[Chris Leary [:cdleary] (not checking bugmail)]

Think this is a dup of bug 599854, will check later.

Comment 2

[David Mandelin [:dmandelin]]

Fixed by the patch for bug 599854. The test case in comment 0 is a test case in that patch, so it won't get forgotten.