I have a tld that was recently created (2014) and I still cannot use it in an email address reliably.

The domain in question being david.kitchen, so an email may be email@david.kitchen

The issue I encounter more than any other is trivial: Most sites still have a tld validation that only accepts domains that end in net|com|org and some other small list of accepted suffixes such as co.uk

The list of TLDs is constantly expanding https://newgtlds.icann.org/en/program-status/sunrise-claims-... so even `[a-z0-9.-]+@[a-z0-9.-]+\.[a-z0-9]+` would be better than what I see in the wild.