> I want to block some web sitie of sex,

Do you have fixed set of web urls in that specific kind?
If so then to make the task is easy.

> for example if any user want to load
> www.sexy.com, the squid don�t let see this web,
> I want to use filter expresion regular.

If you don't want to allow the user to access a url which contains a word "sex" then 
set an acl as

acl wordsex urlpath_regex sex
acl blockuser src <ip-addess>/<netmask>
http_access deny blockuser wordsex

If you want to block the specific url to a user,

acl sexurl url_regex ^http://www.sexy.com

or

acl sexurl dstdomain .sexy.com

http_access deny user sexurl

It is good to have the set of urls you want to block and the blocking to the specific 
users or to all.

Regards,
Muthukumar.



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