iswitchb and regexps.

[Michael Cadilhac]

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

With iswitchb-mode, C-x b, then hit C-t to enable regexp mode, and then `['.

This gives me the following error message:
Error in post-command-hook: (invalid-regexp Unmatched [ or [^)
then makes buffer switching completely unusable until C-g.


In GNU Emacs 22.0.50.1 (i686-pc-linux-gnu, X toolkit)
 of 2005-05-22 on mahaena
Distributor `Gentoo (The X.Org Foundation 6.8.2, revision r1-0.1.2)', version 
11.0.60802000
Important settings:
  value of $LC_ALL: nil
  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: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  display-time-mode: t
  show-paren-mode: t
  partial-completion-mode: t
  iswitchb-mode: t
  mouse-wheel-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  column-number-mode: t
  line-number-mode: t
  next-error-follow-minor-mode:  Fol

Recent input:
<return> C-n C-x b e <backspace> j a <return> C-x b 
<return> M-x v e r s i o n <return> C-n M-x i s w <tab> 
C-g C-x b C-t [ C-g C-n C-x b C-g L C-r d e C-v C-n 
C-n <return> 1 <return> / o <return> M-> C-r i s w 
C-n q C-t C-t <return> <return> M-> C-r i s w i C-n 
q C-n C-n <return> 1 <return> a n C-c C-k q M-x r e 
p <tab> o <tab> r <tab> <return>

Recent messages:
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Loading flyspell...done
Starting new Ispell process...
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-- 
    Michael Cadilhac, a.k.a. Micha [mika] |
                    Epita/LRDE promo 2007 |  Please note that you should
  2 rue de la Convention | 01.46.70.90.75 |  s/address@hidden/@/ my mail 
address.
94270 Le Kremlin Bicetre | 06.23.20.31.30 |

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