Regex for extracting second level domain from FQDN?
- by Bob
I can't figure this out. I need to extract the second level domain from a FQDN. For example, all of these need to return "example.com":
example.com
foo.example.com
bar.foo.example.com
example.com:8080
foo.example.com:8080
bar.foo.example.com:8080
Here's what I have so far:
Dim host = Request.Headers("Host")
Dim pattern As String = "(?<hostname>(\w+)).(?<domainname>(\w+.\w+))"
Dim theMatch = Regex.Match(host, pattern)
ViewData("Message") = "Domain is: " + theMatch.Groups("domainname").ToString
It fails for example.com:8080 and bar.foo.example.com:8080. Any ideas?
