When you purchase a domain name, the issuing company will send your personal details to the WHOIS database.

I highly recommend you visit Regxr and use the on-line Regex expression builder there to create and test your expression.

To acquire an SSL certificate you must prove to the issuing company that you are the registered owner of the domain.

Although the process varies according to the domain host, you may need to provide the issuing company with identification such as a copy of your passport or drivers license.

To validate you domain name you must simply prove that you are the owner of the domain.

If your website collects information on its users or processes payments, many people will want to know that they are dealing with a legitimate business.