Rule that does nothing than matching

Hi,

I want to have a rule that matches on a header. Based on the
result of this match I want to have further rules executed.

(1) How can I have a rule that does only the matching?

(2) How to easy compare the matched part in $MATCH with a
    string in a rule?

Thanks for any hints, examples,
-sa

-- 
sa at programmers-world dot com http://www.livingit.de
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