Regular Expression help in v5.05B2

I'm probably being really dumb here but help!
I'm trying to filter out the piles of trojans currently doing the rounds in many groups, for example a subject header of :-
(APPZ) Uploaded by datacore- "blah blah"
So I have a filter setup as ^\(APPZ\).Uploaded.*
I've added this profile to each of the groups but it simply won't work, In one case it just filtered everything out even things that didn't even slightly match, what am I doing wrong?
I'm trying to filter out the piles of trojans currently doing the rounds in many groups, for example a subject header of :-
(APPZ) Uploaded by datacore- "blah blah"
So I have a filter setup as ^\(APPZ\).Uploaded.*
I've added this profile to each of the groups but it simply won't work, In one case it just filtered everything out even things that didn't even slightly match, what am I doing wrong?