Help with proxy scenario

[markcapelle at pcmc.com]

I have a need to proxy users based on either AD group membership or a
substring in the username.  I am currently using LDAP to AD .

AD group membership scenario: If user is in group "x" then proxy to radius
server "y".

Substring scenario: If username contains string "x", then strip "x" and
proxy to server "y".

I believe both could work.  Which is easiest and what modules are needed?
Also, any examples of either would be greatly appreciated.

Thanks,
     Mark
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