GNU bug report logs - #7227
re-search-forward goes infinite loop with dash inside []

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Jari Aalto <jari.aalto <at> cante.net>
Subject: bug#7227: closed (Bug#7227 Close bts:gnu)
Date: Fri, 22 Oct 2010 07:52:02 +0000

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Your bug report

#7227: re-search-forward goes infinite loop with dash inside []

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 7227 <at> debbugs.gnu.org.

-- 
7227: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7227
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Jari Aalto <jari.aalto <at> cante.net>
To: 7227-done <at> debbugs.gnu.org
Subject: Bug#7227 Close bts:gnu
Date: Fri, 22 Oct 2010 10:55:43 +0300

Reason for close:

Not a bug. In non-matching case, the regexp engine pumps up; thus "Loop
effect" feel.

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From: Jari Aalto <jari.aalto <at> cante.net>
To: submit <at> debbugs.gnu.org
Subject: re-search-forward goes infinite loop with dash inside []
Date: Sat, 16 Oct 2010 12:16:01 +0300

Package: emacs
Version: 23.2+1-4
Severity: normal

Executing the following code causes Emacs to go into infinite loop.
Simply run it behind the last paren with C-x C-e

(re-search-forward "^\\([a-z0-9.-]+\\)+[ \t]+\\([0-9]+\\) +\\([a-z].*\\)")
                        ==========

If the dash is taken awy from the "[a-z0-9.-]", this code does not cause
infinite loop:

(re-search-forward "^\\([a-z0-9.]+\\)+[ \t]+\\([0-9]+\\) +\\([a-z].*\\)")

TEST ROWS FOR THE REGEXPS:

row-one 1234 rest of line

row2    1234 rest of line

TEST SETUP

emacs -Q --no-site-file
<copy the re-search-forward lisp statements into buffer>
<copy the test rows into buffer>
<Execute lisp statements>

-- System Information
Debian Release: squeeze/sid
  APT Prefers testing
  APT policy: (990, testing) (500, unstable) (1, experimental)
Architecture: amd64
Kernel: Linux picasso 2.6.32-5-amd64 #1 SMP Fri Sep 17 21:50:19 UTC 2010 x86_64 GNU/Linux
Locale: LANG=en_DK.UTF-8

-- Versions of packages `emacs depends on'.
Depends:
emacs23         23.2+1-4        GNU Emacs is the extensible self-documenting
emacs23-lucid   23.2+1-4        GNU Emacs is the extensible self-documenting
emacs23-nox     23.2+1-4        GNU Emacs is the extensible self-documenting

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