Walled Garden regex???

I’m so frustrated…

Can anyone tell me how to do this with Mikrotik’s walled garden as I can’t seem to figure it out.

I need to add a domain name

fbcdn-profile-a.akamaihd.net

problem with that is that the domain name may change. So I want to add something like *.akamaihd.net, that does not work.

So I have tried all of these

:.*\.akamaihd\.net
.*\.akamaihd.net
*.akamaihd.net

Nothing works.

Now…The most bizarre part.

This does work

.*\-profile-a.akamaihd.net

That actually allows it to go through the walled garden.

So I dont see why .-profile-a.akamaihd.net would work but not ..akamaihd.net

If anyone could shed some light, that would be great