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

[Jari Aalto]

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