[squid-users] how ccan i block aplication and media dfile downloading in squid

[aol]

my acl is for blocking downloading
acl dlb urlpath_regex -i .exe$ .mp3$ .mov$ .mpg$ .mp?$ .avi$ .rm$
.wma$ .mpeg$
http_access deny dlb
but it is not working and also how can i block down loading in a time range