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regex bug with pattern "\\*/" matching end of buffer */

From: Geoff Odhner
Subject: regex bug with pattern "\\*/" matching end of buffer */
Date: Tue, 26 Apr 2005 14:07:25 -0400

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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 21.3.1 (i686-pc-linux-gnu, X toolkit)
 of 2005-03-24 on monster
configured using `configure  --prefix=/home/geoff/i686 
Important settings:
  value of $LC_ALL: C
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

If I have a file with the following line (no trailing space):

        char    ch;     /* sample comment */

then I put the cursor on it and execute the following elisp code:

          (narrow-to-region (progn (beginning-of-line) (point))
                            (progn (end-of-line) (point)))
          (goto-char (point-min))
          (while (and (re-search-forward "/\\*"  nil t) (not (eobp)))
            (replace-match "/-*" nil nil))
          (goto-char (point-min))
          (while (and (re-search-forward "\\*/"  nil t) (not (eobp)))
            (replace-match "*-/" nil nil)))

it will give me the following line as the result:

        char    ch;     /-* sample comment */

In contrast, what I expect is this:

        char    ch;     /-* sample comment *-/

If I add a trailing space, then I get appropriate behavior.


Geoff Odhner

Recent input:
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> r e p l <tab> s t <tab> <return> C-x 0 
<help-echo> <switch-frame> <down-mouse-1> <mouse-movement> 
<mouse-1> <kp-subtract> <up> <kp-add> A-s <f2> <up> 
<up> <up> <return> <up> <up> <return> <f10> <f2> w 
i d <tab> e <tab> <return> <C-kp-add> A-z <f2> k <return> 
<f2> r e l SPC <return> <f3> <S-kp-add> A-z C-x C-v 
<return> <next> <next> <next> <down-mouse-1> <mouse-1> 
<C-kp-add> A-z <down-mouse-1> <mouse-1> <kp-subtract> 
<down> <kp-add> A-z <up> A-z A-s <down-mouse-1> <mouse-1> 
<down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> SPC 
<S-kp-add> A-z A-z <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <menu-bar> <help-menu> 

Recent messages:

Mark set [2 times]
Line eaten
Mark set [2 times]
Line inserted
Undo! [2 times]
Wrote /home/geoff/ggoo/elisp/el/lines-G.el
Undo! [2 times]
Loading emacsbug...done

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