python - Regex to match Domain.CCTLD

Question

Does anyone know a regular expression to match Domain.CCTLD? I don't want subdomains, only the "atomic domain". For example, docs.google.com doesn't get matched, but google.com does. However, this gets complicated with stuff like .co.uk, CCTLDs. Does anyone know a solution? Thanks in advance.

EDIT: I've realized I also have to deal with multiple subdomains, like john.doe.google.co.uk. Need a solution now more than ever :P.

Answer 1

It sounds like you are looking for the information available through the Public Suffix List project.

A "public suffix" is one under which Internet users can directly register names. Some examples of public suffixes are ".com", ".co.uk" and "pvt.k12.wy.us". The Public Suffix List is a list of all known public suffixes.

There is no single regular expression that will reasonably match the list of public suffixes. You will need to implement code to use the public suffix list, or find an existing library that already does so.