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In GNU Emacs 21.2.1 (i686-pc-linux-gnu, GNU/LessTif Version 1.2 Release 0.92.32)
 of 2002-03-19 on seal.service.jet.msk.su
configured using `configure  --prefix=/usr --with-x-toolkit=motif'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: ru_RU.koi8r
  value of $LC_CTYPE: ru_RU.koi8r
  value of $LC_MESSAGES: ru_RU.koi8r
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: C
  value of $LC_TIME: C
  value of $LANG: ru_RU.koi8r
  locale-coding-system: cyrillic-koi8
  default-enable-multibyte-characters: t

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

I got this error many times when i read my mail with gnus via
pop3. Gnus read data from pop3 server in binary mode and some time
this bug lead to loss my letters.

to reproduce this i write test case (in attachment). To reproduce you
need open test.el in emacs and eval it twice (i can't understand why
it not worked in first pass). file emacs-test-mail.txt must be in one
dir with test.el - it is my test mail letter. after eval you got two
buffers -- *test-case* with results of command output, and
*test-result* with results of regexp match (buggy). 

This error arise only when exists small russian char 'r', and also
exists char '.' in end of string. so "^\\.\r\r" will match full
string. 


Recent input:
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> t e 
s <tab> <return> <down-mouse-1> <mouse-1> <menu-bar> 
<emacs-lisp> <eval-buffer> <down-mouse-1> <mouse-1> 
C-x b * t <tab> <tab> c <tab> <return> C-x k <return> 
C-x b * t e <tab> <return> C-x k <return> <menu-bar> 
<emacs-lisp> <eval-buffer> C-x b * t e <tab> r e <tab> 
<return> C-x k <return> C-x b * t e <tab> <return> 
C-x k <return> C-x k <return> <up> <down> <left> <down> 
<left> <left> M-g m e m <backspace> <backspace> C-x 
k <return> y <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<menu-bar> <help-menu> <report-emacs-bug>

Recent messages:
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nnml: Reading incoming mail from pop... [3 times]
nnml: Reading incoming mail (no new mail)...done
nnml: Reading incoming mail from pop... [3 times]
nnml: Reading incoming mail (no new mail)...done
Making completion list...
nnml: Reading incoming mail from pop... [3 times]
nnml: Reading incoming mail (no new mail)...done
Parsing /home/ott/.mailrc... done
Loading emacsbug...done