Layer 7 protocol filter did't work for me

RouterOS Beginner Basics
1

Hello to all,
I have mikrotik routeros x86, i want block mp3, ios and exe setup for my clients, then i create rules like this:

/ip firewall layer7-protocol add name=downloading regexp=“.exe | .iso | .mp3”
/ip firewall filter add src-address=192.168.88.0/24 action=drop chain=forward disabled=no layer7-protocol=downloading

But its not work, nothing happened, layer 7 protocol did’t filter in firewall rule.
Can anyone please suggest me the way to block downloading mp3, ios and exe setup. Thanks in advance.

2

Most downloads are https, and L7 filter won’t see filename.

Try matching on:
^..+.(exe|iso|mp3|EXE|ISO|MP3).*$