From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: bug in elisp... or in elisper???
Date: Wed, 23 Mar 2011 11:27:34 -0400 [thread overview]
Message-ID: <jwvpqphdfti.fsf-monnier+gnu.emacs.help@gnu.org> (raw)
In-Reply-To: mailman.3.1300889938.15160.help-gnu-emacs@gnu.org
> I am, however, starting to have trust issues with documentation I find
> on the web.
Don't believe everything you read.
> Is it actually true (what the docs say) that there's a limit of nine
> sub-expression match-strings per RE?
No.
> Or can I do, e.g., "(match-string 12)" and "(match-string 15)"?
Yes.
> What is the actual limit?
The limit currently is around 255 sub-groups (or maybe 127), IIRC.
OTOH back-references can only refer to subgroups 1-9 (because we
haven't bothered to introduce a syntax for other cases).
> Whatever it is, is this hard-coded into elisp... or can it be
> changed/configured to something else?
It's hardcoded in the C code of the regexp engine.
BTW, I recommend you use the "online" documentation distributed with
Emacs. There are function and variable docstrings (C-h f, C-h v), plus
Info documents (Emacs manual, Elisp manual). We work pretty hard to keep
those up-to-date and of good quality. And if you find something to be
untrue in there, please report it via M-x report-emacs-bug.
Stefan
next prev parent reply other threads:[~2011-03-23 15:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-22 23:37 bug in elisp... or in elisper??? ken
2011-03-23 0:15 ` PJ Weisberg
2011-03-23 14:18 ` ken
2011-03-25 3:44 ` Kevin Rodgers
[not found] ` <mailman.3.1300889938.15160.help-gnu-emacs@gnu.org>
2011-03-23 15:27 ` Stefan Monnier [this message]
[not found] <mailman.11.1300837050.13753.help-gnu-emacs@gnu.org>
2011-03-22 23:50 ` David Kastrup
2011-03-23 15:21 ` ken
2011-03-23 15:38 ` David Kastrup
2011-03-23 7:01 ` Tim X
2011-03-23 15:56 ` ken
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