The functions pre.subn() and pre.sub() are broken in
Python2.2 and 2.2.1. The following test was done on
SunOS 5.6:

Python 2.2.1 (#1, Jun 13 2002, 12:57:34) 
[GCC 2.95.2 19991024 (release)] on sunos5
Type "help", "copyright", "credits" or "license" for
more information.
>>> import re
>>> re.sub('(a)', '\g<1>', 'bab')
'bab'
>>> import pre as re
>>> re.sub('(a)', '\g<1>', 'bab')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/local/tools/lib/python2.2/pre.py", line
179, in sub
    return pattern.sub(repl, string, count)
  File "/usr/local/tools/lib/python2.2/pre.py", line
344, in sub
    return self.subn(repl, string, count)[0]
  File "/usr/local/tools/lib/python2.2/pre.py", line
366, in subn
    repl = pcre_expand(_Dummy, repl)
TypeError: 'NoneType' object is not callable

The error has also been reproduced on SunOS5.7 with the
following interpreter:
Python 2.2 (#1, Dec 28 2001, 22:25:04) 
[GCC 2.95.2 19991024 (release)] on sunos5

The error could not be reproduced on SunOS5.6 using
Python2.1.1:
Python 2.1.1 (#5, Sep 10 2001, 13:44:17) 
[GCC 2.95.2 19991024 (release)] on sunos5

NOTE: The example for re.sub() in the Python Library
manual triggers this bug when used with module pre!

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someone who didn't understand the code changed an
"except" to "except error", and the test suite doesn't
spend much energy checking that PRE works as it
should... :-(

(as a workaround, change the line after the "pcre_expand"
call to "except:")

</F>

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fixed in CVS