[Evolution] Filtering junk by unicode character range

[John Spray <spray lyx org>]

Hi,

The evo junk mail filtering doesn't seem to be doing anything at all
against some Japanese spam I'm getting a lot of.  I would assume this is
because it's not able to spot patterns in this language?  Alternatively,
perhaps there's a character encoding problem at work?

Anyway, I would like to simply create a filter that would mark anything
with Hiragana/Katagana characters in the subject as spam -- does anyone
have any ideas for how to do this?  Perhaps it's possible with a regex,
but I can't find how to specify such a range in unicode.

Cheers,
John