[issue3665] Support \u and \U escapes in regexes

[Atsuo Ishimoto]

Atsuo Ishimoto <ishimoto at gembook.org> added the comment:

Here's an updated patch for py3k branch. 
As per Georg's comment, I added to check codepoint in the character 
ranges, conversion to the surrogate pairs. I also added check to raise 
exception if codepoint > 0x10ffff.
I with to English speakers to fix error messages in the patch.

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nosy: +ishimoto
Added file: http://bugs.python.org/file17939/3665.patch

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