# IPTABLES
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 3128

# /etc/squid/squid.conf
http_port 3128 transparent

visible_hostname meu_router

acl domains dstdomain uol.com.br
http_access deny domains

acl domains2 dstdomain "/etc/squid/blocked.acl"
http_access deny domains2

acl sexologia url_regex -i sexologia
http_access allow sexologia

acl sex url_regex -i sex
http_access deny sex

acl all src 0.0.0.0/0.0.0.0
http_access allow all