Vlastimil Brom <vlastimil.b...@gmail.com> added the comment:

Is the issue2636-20100222.zip archive supposed to be complete? I can't find not 
only the rst or html "features", but more importantly the py and pyd files for 
the particular versions.

Anyway, I just skimmed through the regular-expressions.info documentation and 
found, that most features, which I missed in the builtin re version seems to be 
present in the regex module;
a few possibly notable exceptions being some unicode features:
http://www.regular-expressions.info/unicode.html 
support for unicode script properties might be needlessly complex (maybe unless 
http://bugs.python.org/issue6331 is implemented)

On the other hand \X for matching any single grapheme might be useful, 
according to the mentioned page, the currently working equivalent would be 
\P{M}\p{M}*
However, I am not sure about the compatibility concerns; it is possible, that 
the modifier characters as a part of graphemes might cause some discrepancies 
in the text indices etc. 

A feature, where i personally (currently) can't find a usecase is \G and 
continuing matches (but no doubt, there would be some some cases for this).

regards
   vbr

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