Updates:
Status: WorkingAsIntended
Comment #2 on issue 2924 by [email protected]: Regular expression
takes exponential time
https://code.google.com/p/v8/issues/detail?id=2924
Well, this *is* an exponential-time regexp.
Most of the observed difference was due to Firefox's optimization to not
even compute regexp results that weren't used. See the FF29 numbers in
http://jsperf.com/regex-exponential-blowup/5 for what happens when the
result is used.
Also, in the meantime this has been "fixed" in Firefox; Chrome 39 is now
twice as fast as FF 33 :-P
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