Recipe Correct

I've got two short recipes and would appreciate someone telling me if
I've written them correctly. Here is recipe #1:

Filters on null subject on just the subject line "Re:" and
off to spam folder:
:0
* ^(Subject:""|^Subject:.*\$\$\$)
* ^(Subject:Re:|RE:|^Subject:.*\$\$\$)
$MAILDIR/spam

Marvin


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