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[perl #129903] regexec.c stack overflow

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Father Chrysostomos via RT
October 20, 2016 20:12
[perl #129903] regexec.c stack overflow
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On Thu Oct 20 00:37:45 2016, demerphq wrote:
> On 19 October 2016 at 23:29, demerphq <> wrote:
> So following up for this I put together a quick hack to make it
> possible to use the empty pattern in regexen, but honestly I dont see
> how it is very useful, it is all too easy to create an infinite loop
> (which luckily seems to be easy to detect).
> ./perl -le'$_="aa"; /a/; /(?{ s!!x! })/; print; //; print'
> xa
> Infinite recursion via empty pattern at -e line 1.
> I personally think this is no less ugly than the previous patch, but
> if you prefer it I can push it.

I would prefer it, but I do not feel strongly about it.

> FWIW, this seems to be yet another good reason to get rid of the empty
> pattern.

I am still opposed to that, unfortunately. :-)


Father Chrysostomos

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