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rogerd - 3:14 am on Sep 26, 2004 (gmt 0)
If the swear filter won't work, it would probably be a simple hack to look for your spammer's domain(s) and replace them with some other text.
I don't know if phpbb scans profile urls with a swear filter, but one way to defeat persistent spammers is to add their domain name to your swear filter. It will work in forum posts, at least.