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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Inefficient code in reftex-index.el
Date: Wed, 08 Jun 2005 11:59:41 -0400
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    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).

Can't you tell that more easily by seeing if match-beginning returns nil?