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(coffeescript) Freezing, poorly behaved regex to match regex. #2375

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@magicalcookie

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@magicalcookie

Tested in NodeJS 13 and Chrome 79 as well as v8 master.

Input text is around 5k.

In the attached file is a reproduction of a complete freeze when trying to highlight with coffeescript, this also affects auto language detection.
(Complete freeze in this case means, I killed the process after 10 minutes)

From debugging this a bit, it hangs in the exec of the coffeescript regex
var match = matcherRe.exec(s);

I feel like it shouldn't hang and since this hang happens in v8 native code, I am not entirely sure this
is actually an issue with highlightjs, so feel free to close this if appropriate.

Is it expected behavior for a browser to hang in such a case or abort after some amount of time? I am not entirely sure, would appreciate some info on this.

I was thinking about filing a but report on the v8 bug tracker but decided to hold off until I get some feedback here first.

test.txt

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