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What is a regular expression which will match a valid domain name . . . The domain name part should not start or end with dash (-) (e g -google- com) The domain name part should be between 1 and 63 characters long The extension (TLD) can be anything under #1 rules for now, I may validate them against a list later, it should be 1 or more characters though Edit: TLD is apparently 2-6 chars as it stands
Can (domain name) subdomains have an underscore _ in it? "domain name" is an ambiguous term What it means vary when used in a DNS settings vs when viewed in a "registration" setting, aka when you are about to register a given name You can't register a domain name with an underscore because in the registration plane a domain name is in fact more an hostname in the DNS terminology and hence more restrictive in allowed characters (but then there are
Difference between IP address and Domain Name - Stack Overflow A name, hostname, domain name, F ully Q ualified D omain N ame are all identifiers for human consumption, computers mostly do not use them The DNS system and the nameservers participating in it, among other things, allows to map a given name to a set of IP addresses
c++ - How to get Windows domain name? - Stack Overflow the USERDNSDOMAIN environment variable returns the domain name of the logged on user, which can be different from the machine Microsoft has a knowledge base article How to retrieve current user and domain names on Windows NT, Windows 2000, or Windows XP, which relies on getting the user's security token and calling LookupAccountSid
dns - Custom domain for GitHub project pages - Stack Overflow Enter your custom domain name here and hit save: ) This is a subtle, but important step If the custom domain you added to your GitHub Pages site is example com, then www example com will redirect to example com If the custom domain you added to your GitHub Pages site is www example com, then example com will redirect to www example com
c# - Get host domain from URL? - Stack Overflow It seems the question is for the host in the URL, and not the domain of the host, unless I completely misunderstand "host domain" (as opposed to just "host")
dns - Determine domain name in JavaScript? - Stack Overflow Then you can take the last two elements (the domain name and extension) using slice(), and join() them back together with the character as the separator, which will allow you to compare directly to the expected domain name:
How do I find the authoritative name-server for a domain name? The origin (or primary name server on Windows) line tells you that ns51 domaincontrol is the main name server for stackoverflow com At the end of output all authoritative servers, including backup servers for the given domain, are listed