Regex For Domain Name Validation. Use Tools to explore your results. Represents the starting of the string.
Validate an ip address Match or Validate phone number Match html tag Empty String Match dates MDYY MDYYY MMDDYY MMDDYYYY Checks the length of number and not starts with 0 all except word Not Allowing Special Characters Find any word in a list of words Match a valid hostname Person Name Validate datetime string between quotes. First go to ietf website download and parse a list of legal level 1 domain names. A complete domain name must have one or more subdomain names and one top-level domain name.
Username may NOT startend with -_ or any other non alphanumeric character.
It matches all letters and digits at the start of the domain name. Its the name validation regex built into your form that has failed them. Check whether each part of the domain is not longer than 63 characters. The assumption is that the TLD should be atleast two letters.