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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.
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The domain name should be a-z or A-Z or 0-9 and hyphen (-). The domain name should be between 1 and 63 characters long. The domain name should not start or end with a hyphen(-) (e.g. -geeksforgeeks.org or geeksforgeeks.org-). The last TLD (Top level domain) must be at least two characters and a maximum of 6 characters.
If you want to find out if a domain name is validated, simply type the URL into the WHOIS database. The search results will also provide you with other crucial information such as who owns it, when it was registered and when it is due to expire.
Domain names (including the names of domains, hosted zones, and records) consist of a series of labels separated by dots. Each label can be up to 63 bytes long. The total length of a domain name cannot exceed 255 bytes, including the dots.
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.
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