filtering chinese characters

I'm receiving more and more unwanted chinese/taiwanese email.
I thought of testing the subject for the occurence of three or more
characters > \200 by a regeular expression of something
like

[\200-\377]{3,} 

Would that work?

-- 
Chris Christoph P. U. Kukulies 
kuku(_at_)gil(_dot_)physik(_dot_)rwth-aachen(_dot_)de
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