From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Font lock question Date: Wed, 17 Mar 2021 11:33:30 -0400 Message-ID: References: <87a6r29hkl.fsf@fastmail.fm> <87r1kdx1ge.fsf@fastmail.fm> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="14436"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:ITn+FeAoWPpRj+C5UePDUz/UAPw= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Mar 17 16:35:10 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lMYCT-0003Wa-14 for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 17 Mar 2021 16:35:09 +0100 Original-Received: from localhost ([::1]:58074 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lMYCS-0004Ch-0X for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 17 Mar 2021 11:35:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49292) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lMYB0-0004BH-EK for help-gnu-emacs@gnu.org; Wed, 17 Mar 2021 11:33:38 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:46710) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lMYAy-0006ML-SO for help-gnu-emacs@gnu.org; Wed, 17 Mar 2021 11:33:38 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lMYAx-0001MF-3n for help-gnu-emacs@gnu.org; Wed, 17 Mar 2021 16:33:35 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:128431 Archived-At: >>> I have no trouble composing a regex that matches this entire thing. I'd add a >>> shy group that includes an optional semicolon and that is repeated at least >>> once: >>> >>> \[\(?:\(?1:.*?\)B\(?2:.*?\);?\)+\] >>> >>> However, this does not work for font-lock, it seems. >> >> Can you clarify what you mean by "doe snot work"? > > Of course. :-) What I mean is that in my test case, e.g., with the following > text in the buffer: > > [aBc; aBc; aBc] > > only the final `aBc` has the right font-lock faces applied to it. The first two > occurrences of `aBc` have no special face. Ah I see: Emacs's regular expression engine is like that of POSIX and most other languages: it only keeps track of the last repetition of a given subgroup in the match-data it returns. > I'm testing with the following: > > ``` > (font-lock-add-keywords nil > '(("\\[\\(?:\\(?1:[[:alnum:]]*?\\)\\(?2:B\\)\\(?3:[[:alnum:]]*?\\)[;[:blank:]]*?\\)+\\]" > (1 font-lock-warning-face) > (2 font-lock-keyword-face) > (3 font-lock-warning-face)))) Indeed that won't do what you want. You're going to have to either manually loop through all the matches of of aBc within the brackets, or use font-lock-keywords's `MATCH-ANCHORED` to do that for you. But be aware that these approaches still won't work well if the [...] thing can span multiple lines. Stefan