How to block mp3, mpg, mpeg, exe files in Squid proxy server

1.Open the squid configuration file in /etc/squid/squid.conf

2.Add a acl to block the required filetypes

acl blockfileset urlpath_regex "/etc/squid/block.acl"
http_access deny blockfileset


3.Create the file block.acl and update the below contents

\.[Ee][Xx][Ee]$
\.[Aa][Vv][Ii]$
\.[Mm][Pp][Gg]$
\.[Mm][Pp][Ee][Gg]$
\.[Mm][Pp]3$