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

Thanks for the comment for string.letters and further reference.
Given, that Mr. Barnett mentioned in his tracker to regex ( 
http://code.google.com/p/mrab-regex-hg/issues/detail?id=6 ), that he only 
supports the LOCALE flag because of the compatibility with re and given my zero 
knowledge of C, I suppose, we will live with the status quo.
I guess, if there were a well defined source of "letters" for the given 
locales, the implementation wouldn't necessarily have to be be that complex (in 
the context of the regex code), but as there is probably no agreement in this 
respect (if string.letters is questionable), it becomes pointless.
After all, one can define a needed regex pattern manually, and mrab's regex 
library makes it much easier due to the support for unicode properties and 
others.

vbr

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