Type address:HostNameOrDottedQuad
This regex matches one of three possibilities:
- Host name (i.e. my-host123)
- Fully-qualified host name (i.e. my-host123.example.com)
- IP address (1.2.3.4)
- The host name and domain can contain letters, digits and hyphen.
- The host name and sub-domains must start with a letter or digit. The top-level domain must start with a letter.
- The top-level domain must start with a letter.