Filter Issue

Hiya,
 
I have the following;
 
:0:
* ^Subject:.*Perl*
Perl
 
which works famously... however,
 
:0:
* ^Subject:.*Perl*
Perl/Mails
 
won't... and I need to place mail in a subdirectory... :(
 
can anyone please help?
 
thanks in advance,
 
Darryl Waterhouse