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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: "Yue Yi" <include_yy@HIDDEN> Subject: bug#76731: Acknowledgement (C-style comment regexp example in (info "(elisp)Rx Notation") is not correct) Message-ID: <handler.76731.B.174106128829995.ack <at> debbugs.gnu.org> References: <tencent_225F4E92EFB870E4C7062BE2CA5568F9CE08@HIDDEN> X-Gnu-PR-Message: ack 76731 X-Gnu-PR-Package: emacs Reply-To: 76731 <at> debbugs.gnu.org Date: Tue, 04 Mar 2025 04:09:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 76731 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 76731: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76731 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN Subject: bug#76731: C-style comment regexp example in (info "(elisp)Rx Notation") is not correct Resent-From: Stefan Kangas <stefankangas@HIDDEN> Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> Resent-CC: bug-gnu-emacs@HIDDEN Resent-Date: Tue, 04 Mar 2025 18:11:02 +0000 Resent-Message-ID: <handler.76731.B76731.174111186118988 <at> debbugs.gnu.org> Resent-Sender: help-debbugs@HIDDEN X-GNU-PR-Message: followup 76731 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Yue Yi <include_yy@HIDDEN>, 76731 <at> debbugs.gnu.org Cc: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= <mattias.engdegard@HIDDEN> Received: via spool by 76731-submit <at> debbugs.gnu.org id=B76731.174111186118988 (code B ref 76731); Tue, 04 Mar 2025 18:11:02 +0000 Received: (at 76731) by debbugs.gnu.org; 4 Mar 2025 18:11:01 +0000 Received: from localhost ([127.0.0.1]:60811 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tpWjM-0004wB-MV for submit <at> debbugs.gnu.org; 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Tue, 04 Mar 2025 10:10:45 -0800 (PST) Received: from 753933720722 named unknown by gmailapi.google.com with HTTPREST; Tue, 4 Mar 2025 18:10:43 +0000 From: Stefan Kangas <stefankangas@HIDDEN> In-Reply-To: <tencent_225F4E92EFB870E4C7062BE2CA5568F9CE08@HIDDEN> References: <tencent_225F4E92EFB870E4C7062BE2CA5568F9CE08@HIDDEN> MIME-Version: 1.0 Date: Tue, 4 Mar 2025 18:10:43 +0000 X-Gm-Features: AQ5f1JoEcmfKE__1Pn5LoQkIELdy0fdY9VkC4LHG8YKxjEvUL_ylLaUepJ68SGw Message-ID: <CADwFkmmvJpOC5S50YhcLO3-sxNi_JGtX0vv7A-X_cYpK4-Pfuw@HIDDEN> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) "Yue Yi" via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN> writes: > Hello Emacs, > > In Elisp Manual's Rx Notation section, we have > > ------------------------------------------------------------------- > > Here is an =E2=80=98rx=E2=80=99 regexp(1) that matches a block comment= in the C > programming language: > > (rx "/*" ; Initial /* > (zero-or-more > (or (not "*") ; Either non-*, > (seq "*" ; or * followed by > (not "/")))) ; non-/ > (one-or-more "*") ; At least one star, > "/") ; and the final / > > or, using shorter synonyms and written more compactly, > > (rx "/*" > (* (| (not "*") > (: "*" (not "/")))) > (+ "*") "/") > > In conventional string syntax, it would be written > > "/\\*\\(?:[^*]\\|\\*[^/]\\)*\\*+/" > -------------------------------------------------------------------- > > Sadly, this regexp is not correct, as demonstated by this simple > example: (Try M-x isearch-forward-regexp with > /\*\(?:[^*]\|\*[^/]\)*\*+/) > > /***/ 123 /* anything else */ > > As you can see, the entire line above is highlighted by the search, > meaning that the whole line has been matched. In fact, this issue > occurs when the number of asterisks in /*(nstar)*/ is odd. > > The correct regular expression is: > > /\*\(?:[^*]\|\*+[^*/]\)*\*+/ > > The corresponding RX expression in the original document could be: > > (rx "/*" > (zero-or-more > (or (not "*") > (seq (one-or-more "*") > (not (or "*" "/"))))) > (one-or-more "*") > "/") > > Or: > > (rx "/*" > (* (| (not "*") > (: (1+ "*") (not (or "*" "/"))))) > (1+ "*") "/") > > BTW, using non-greedy `*?', the simplest way might be: > > (rx "/*" > (*? anything) > "*/") > > "/\\*[^z-a]*?\\*/" or "/\\*\\(?:.\\|\n\\)*?\\*/" > > Regards. Mattias, any comments?
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