[issue2636] Regexp 2.7 (modifications to current re 2.2.2)

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

issue2636-features-3.diff is based on the 2.x trunk.

Added comments.
Restricted line lengths to no more than 80 characters
Added common POSIX character classes like [[:alpha:]].
Added further checks to reduce unnecessary backtracking.

I've decided to remove \onnn and \x{n} because they aren't supported
elsewhere in the language.

Added file: http://bugs.python.org/file13165/issue2636-features-3.diff

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