Complete Layer-7 Regex For All Media Extention
/ip firewall layer7-protocol
add comment=media-extention name=media-extention regexp="^.*get.+\\.(swf|mov|wmv|mpg|mpeg|mkv|avi|flv|wav|mp3|mp4|vcd|mp2|3gp|mpe|wma|wv|vox|tta|sln|raw|ra|rm|opus|ogg|oga|msv|mpc|mmf|iv s|iklax|gsm|dvf|dss|dct|awb|au|amr|acc|aiff|act).*\$"
Credit: www.o-om.com