Adding acls in squid

[shalib2]

How to add manual rules in squid ? i need to add a block rule for file types i have created a file like

.[Ee][Xx][Ee]$
.[Ee][Xx][Ee][??]$
.[Aa][Vv][Ii]$
.[Aa][Vv][Ii][??]$
.[Mm][Pp][Gg]$
.[Mm][Pp][Gg][??]$
.[Mm][Pp][Ee][Gg]$
.[Mm][Pp][Ee][Gg][??]$
.[Mm][Pp]3$
.[Mm][Pp]3[??]$
.[Ww][Aa][Vv]$
.[Ww][Aa][Vv][??]$
.[Oo][Rr][Rr][Ee][Nn]$
.[Oo][Rr][Rr][Ee][Nn][??]$

and add

acl blockfiles url_regex "/var/squid/acl/blocks.files.acl";
http_access deny blockfiles;
in squid custom options and restarted squid but squid not working, any idea??/

[shalib2]

i got a solution to block file types using squidguard Destination -> expressions ->.mp3|.exe|.avi|.mpg|.mpeg|.mp4|.3gp

its working fine :)

[elf]

Can I block "https" domain please?