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Re: Inefficient code in reftex-index.el

From: David Kastrup
Subject: Re: Inefficient code in reftex-index.el
Date: Wed, 08 Jun 2005 12:11:35 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

address@hidden (Kim F. Storm) writes:

> David Kastrup <address@hidden> writes:
>>> Actually the only cases I can vaguely remember using the
>>> (/ (length (match-data)) 2) idiom didn't use the whole (match-data).
>>> They typically used the idiom in order to know *which* subgroup matched (of
>>> course it only works if you craft your regexp carefully).
>> That would not work.  (length (match-data)) is a property of the
>> regexp, not the match.
> According to the code, it does work.
> Match data only contains markers until the last successful match.

(progn (string-match "\\(x\\)\\|\\(y\\)" "x") (match-data)) => (0 1 0 1)

I stand corrected.

Hey, can I rely on that?  It would probably speed up some code of mine
where I have to scan for the only non-nil match-beginning.

David Kastrup, Kriemhildstr. 15, 44793 Bochum

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