Block direct access to IP addresses ( use DNS names only )

Hi Everyone,

We want to block any request through Webfiter 7.5 to an IP address, so all requests should be a FQDN.

This was a simple easy 2 second task on our old squidguard system but I can't find a simple solution here.

I thought I could use a regex and websens has an example of using regex

http://www.websense.com/content/support/library/email/hosted/admin_guide/regex.aspx

"The following regular expressions contain syntax errors:"

Anybody got any bright ideas?

Rob