[squid-users] How to limit user access

hello
how to limit some website based on url and/or ext ?
i mean e.g.

i only want to limit access from youtube.com and cnn.com only for user
192.168.1.1 and 192.168.1.2 but not limit for other user
but not other website

have any idea ?
if using delaypoll
can you put complete syntax for delaypolls ?
since i have a little bit difficulty to learn delaypoll

maybe can be use other command except delaypoll ?

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