GNU bug report logs - #17373
24.3.50; match data is incorrect if there are too many groups

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From: Marcin Borkowski <mbork <at> wmi.amu.edu.pl>
To: 17373 <at> debbugs.gnu.org
Cc: Paul Eggert <eggert <at> cs.ucla.edu>, Drew Adams <drew.adams <at> oracle.com>
Subject: bug#17373: 24.3.50; match data is incorrect if there are too many groups
Date: Wed, 10 Feb 2016 18:11:54 +0100

On 2014-05-19, at 07:48, Drew Adams <drew.adams <at> oracle.com> wrote:

>> Yes, unfortunately Emacs currently has a limit of at most 256 groups of
>> match data: one for the entire pattern, and 255 for parenthesized
>> subpatterns.  If you go over the limit, the excess matches are silently
>> discarded.  I don't see this limitation documented anywhere; it should
>> be.  Or better yet, the limitation should be removed.
>
> Good to know.  +1, to documenting it, at least.

I can write a patch to the manual, but I'm a bit afraid that if this
gets documented, the limit will stay there forever.  Is there a chance
of someone fluent in C to fix this?

(Incidentally, I have one package of mine where this limit could strike,
too.)

Best,

--
Marcin Borkowski

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