I ran into this issue with hyper wasn't highlighting my `.localhost` domains, which is a legitimate TLD and used by caddy server to allow SSL certs locally.
Then I went down the rabbit hole of TLDs and found currently the longest TLDs are 14 chars which include .BANANAREPUBLIC, .COOKINGCHANNEL, .KERRYLOGISTICS, .WEATHERCHANNEL
I'm not regex expert, but I *think* this should work? 😀
Wes Bos