I Can Has UR .htaccess File
Published Jul 21, 2009
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I don't think that .htaccess itself can scan the payload, which you'd need to do on either the submit or the response to find offensive URIs and either strip them out or replace them.
However, you can use .htaccess to block access from YOURDOMAIN.com in general. Check out this article on blocking referrer spam and this one as well
HTH,
Lori