From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Nicholas Drozd Newsgroups: gmane.emacs.bugs Subject: bug#45973: replace-regexp lisp replacement bug Date: Mon, 18 Jan 2021 18:15:09 -0600 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40169"; mail-complaints-to="usenet@ciao.gmane.io" To: 45973@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jan 19 01:16:10 2021 Return-path: Envelope-to: geb-bug-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 1l1egs-000ALN-B5 for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 19 Jan 2021 01:16:10 +0100 Original-Received: from localhost ([::1]:45378 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l1egr-0000Ms-9p for geb-bug-gnu-emacs@m.gmane-mx.org; 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Mon, 18 Jan 2021 16:15:21 -0800 (PST) Received-SPF: pass client-ip=2a00:1450:4864:20::630; envelope-from=nicholasdrozd@gmail.com; helo=mail-ej1-x630.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:198107 Archived-At: Here is a string representing a Turing machine program: 1RB 1LC 1RC 1RB 1RD 0LE 1LA 1LD 1RH 0LA Say I have a file full of lines like this, and I want to swap all the Ls for Rs and vice versa. `replace-regexp` is a good way to do it. For the regexp, I use `\(\(L\)\|\(R\)\)`, a matching group with two nested matching alternatives; for the replacement, I use a Lisp expression: `\,(if \2 "R" "L")`. This expression says: if the second match is found (the `L`), replace it with "R", else replace it with "L". In Emacs 27 (b58fd1eab9), this gives the expected result: 1LB 1RC 1LC 1LB 1LD 0RE 1RA 1RD 1LH 0RA But in Emacs 28 (20add1cd22), it gives an error: replace-highlight: Wrong type argument: integer-or-marker-p, nil A simpler replacement does work: `\(L\)\|R` and `\,(if \1 "R" "L")`. But the longer one should work too. I tried to make a Lisp test to reproduce this, but the `\,` replacement feature is interactive-only, and I don't know how to test it non-interactively.