You may have heard, read about, or even seen (gasp!) that the first .XXX Web site in the .XXX Top-Level Domain (TLD) has gone live. I personally believe the TLD is quite useless, but that’s beside the point.
Be that as it may, if you are a developer it is becoming increasingly important
you review your (probably incorrect) regular expressions for validating e-mail
or Web addresses in your app’s enter your e-mail address here field. A lot of
these have hardcoded .{com|net|org}
and a few country-codes for the ccTLDs,
but that’s about it.
A simple DNS query can determine whether the domain or TLD entered as part of a sign-up process exists, and in fact, ICANN has a collection of functions for a variety of programming languages to help you along. Don’t worrry: there’s nothing very fancy or difficult in there.