forward proxy with map rule

[$ubbu]

Hi All,

     How to set forward proxy for few users to access specific websites, i
read the documentation for forward proxy, i didn't get info how to
configure forward proxy with mapping rules. but one person configured
forward proxy and remap.config enabled rule like below:

regex_map http://(.*)/ http://www.example.com/


Thanks
Subrahmanya Prasad P