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Re: [perl #129903] regexec.c stack overflow

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October 20, 2016 07:37
Re: [perl #129903] regexec.c stack overflow
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On 19 October 2016 at 23:29, demerphq <> wrote:
> On 19 October 2016 at 22:51, Father Chrysostomos via RT
>> Similarly, having m|(?{ // })| try to use the *current* pattern instead of the last pattern to match successfully—solely due to an implementation detail—seems wrong.
> Yes I agree.

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'
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.

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


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