regular expressions in URLs

Experts,

The company I work for makes distinction between internal and external
webserver by their name. The internal URLs look like .*://sww.*company.*
The rest is treated as external. This way a local browser contacts its local
proxy-server, in our case Netscape proxy-server, which routes the traffic
according to the above reg.expr. If a match is found a direct connection
between the proxy and the requested webserver will be created. Otherwise the
request will be forwarded to a proxy higher up in the chain, the firewall.

Is there a way that squid can be configured to perform the same task without
knowing the ip-addresses or hostnames of the 'internal' webservers ??

Please also reply to me personally since I'm not a member of this list.

TIA,
Fred

-- 
Fred Donck
e-mail : fred@donck.com                   Voice/Fax/Mobile : +31-70-3112374
Public Key: http://pgp.ai.mit.edu:11371/pks/lookup?op=get&search=0x98EF5569
Key Fingerprint: 79 54 88 FA 03 7B 30 43  BD 62 42 F9 2B 3D 09 96