I have installed squidGuard, which was working fine, now.. it does not filter as per the expressions mentioned, it was doinging it earlier when i had set it up, but after few days, it stopped, i had set expressions for blocking exe files.
squidGuard is blocking sites that i have mentioned as bad.
expressions that i have mentioned is listed below:
\.[Ee][Xx][Ee]$
\.[Aa][Vv][Ii]$
\.[Mm][Pp][Gg]$
\.[Mm][Pp][Ee][Gg]$
\.[Mm][Pp]3$



(\.exe$|\.com$|\.bat$|\.scr$|\.reg$|\.chm$|\.cnf$|\.hta$|\.ins$|\.lnk$|\.pif$)
\.(ra?m|wma|mp2|mpv2|mp3|flv)($|\?)
\.(mpe?g?|wmv|mov|movie|qt|avi|dvd?|divx)($|\?)
\.(ade|adp|bas|bat|chm|cmd|com|cpl|crt|exe|hlp|hta|inf|ins|isp|jse|lnk|mdb|mde|msc|msi|msp)($|\?)
\.(mst|pcd|pif|reg|scr|sct|shs|shb|vb|vbe|vbs|wsc|wsf|wsh)($|\?)


Please help.