[Mailman-Users] List Topic Filter Expression question

I am currently running Mailman 2.1.6.rc2. I am setting up a List with multiple Topics. I have the Topic Filter Enabled. I set number of body lines the topic matcher should scan to 0. I only want the Subject line to be scanned. I would like to filter the incoming messages to unique topics. How do I set up the 'Regexp:' box for each Topic? An example of a subject line is as follows:

Subject: SCAN-ALL-TOPICS

What is the syntax? Thank you very much.

Jeff Peterson

NASA/CASI ASRC Aerospace Corporation