From my own testing those regex entries will most likely not work, you should notice that URLs to those domains are now being blocked.
As an example for my regex entries, I went from 2 entries to 12 entries in the whitelist.
This line matched 2 URLs
^\*\.androidtv[a-z]{8}-pa\.googleapis\.com$
This line matched 10 URLs
^\*\.[a-z0-9-]*\.delivery\.roku\.com$
However whitelisting through the unbound reporting page now works correctly, before it was broken. So I believe this is the reason the change was made, but it's unfortunate the fix breaks regex whitelisting functionality.
As an example for my regex entries, I went from 2 entries to 12 entries in the whitelist.
This line matched 2 URLs
^\*\.androidtv[a-z]{8}-pa\.googleapis\.com$
This line matched 10 URLs
^\*\.[a-z0-9-]*\.delivery\.roku\.com$
However whitelisting through the unbound reporting page now works correctly, before it was broken. So I believe this is the reason the change was made, but it's unfortunate the fix breaks regex whitelisting functionality.