Two suggestions: test before you post (and then test some more) and don't use regexes to parse HTML. Granted, this is trivial HTML to parse, but the more you use parsers, the better you get at it. Also, the more you use templating modules, the better you get at them. I hate to just outright solve the problem, but i did. Here is link that you will have to click to see my solution - so any readers have been warned.

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WARNING *SPOILERS* CLICK AT OWN RISK!
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It's a lot more code than you posted, but it does a lot more as well. ;)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)