Comment #2 on issue 182 by [email protected]: PCRE has changed, resulting in  
newly failing regex tests.
http://code.google.com/p/v8/issues/detail?id=182

Webkit has changed how they deal with quantified look-aheads. Previously,  
they
didn't handle it at all (a legacy of PCRE, and since it's meaningless  
anyway, there
probably hasn't been a drive to fix it). They now handle it by throwing  
away the
quantifier, which is not always correct either. Bug has been filed in
bugs.webkit.com.
Let's not do anything until we see their fix.

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