Block IP Address URI's in Squid

I've got some naughty users who are using IP address URI's to curcumvent Filtering on the firewall.  Is there any way I can make Squid (our proxy server) deny any requests where an IP address exists in the URI?

eg: Deny http://209.85.227.17 but allow http://mail.google.com
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Lester_ClaytonAsked:
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g000seCommented:
Hi,

Here is a good reference link to help you- http://www.linux.com/archive/feature/114084
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Lester_ClaytonAuthor Commented:
Thanks I guess what I'm looking for is url_regex :)  I'll award you the points
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g000seCommented:
Glad to help.  Thanks.
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