From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Philipp Stephani Newsgroups: gmane.emacs.bugs Subject: bug#29343: 27.0.50; Match data doesn't contain elements for non-matched subgroups Date: Fri, 19 Apr 2019 20:22:23 +0200 Message-ID: References: <87in9vv8oa.fsf@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="100158"; mail-complaints-to="usenet@blaine.gmane.org" Cc: 29343@debbugs.gnu.org To: Noam Postavsky Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Apr 19 20:23:15 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hHYAN-000PyG-2b for geb-bug-gnu-emacs@m.gmane.org; Fri, 19 Apr 2019 20:23:15 +0200 Original-Received: from localhost ([127.0.0.1]:59848 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hHYAM-0004T8-0j for geb-bug-gnu-emacs@m.gmane.org; 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M=C3=A4rz 2018 um 01:37 Uhr schrieb Noam Postavsky : > > Philipp Stephani writes: > > > $ emacs -Q -batch -eval '(progn (string-match "^\\(a\\)?\\(b\\)\\(c\\)?= $" "b") (print (match-data)))' > > (0 1 nil nil 0 1) > > > > Note that neither the `a` nor the `c` group matched, but there are > > entries for `a` in `match-data`, but not for `c`. This makes working > > with the match data unnecessarily hard because its length depends on > > whether certain optional groups have matched or not. I haven't seen an= y > > discussion about this behavior in either the manual or the docstring. = I > > think the match data in this case should be (0 1 nil nil 0 1 nil nil). > > You can get that result by passing a list of the expected length as the > REUSE argument to match-data: True, but that also requires knowing the expected length. In the most general case this should work for unknown regular expressions.