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If anything, I think Python should implement Unicode TR#18:

http://www.unicode.org/unicode/reports/tr18/

This does include the \p notation for property expressions,
e.g. \p{Ll} or \p{East Asian Width:Narrow}.

We currently don't include the Script property, so \p{Greek}
could not be implemented (we can, of course, add support for
the script property). I can't find anything in the report
that makes \p{IsGreek} valid, so we shouldn't support it.