Good Question, but I can tell you the one that is in the file (server.cfg) doesn't work. I tried banning the F%ck and Sh*t but the only thing it did was say F%ck and Sh*t on my server info.
i think a couple of posts have been put on Rudedogs website. If your a server admin get over there and sign up. The website is excellent for server issues.
http://www.mohadmin.com