C# regex to validate "realistic" IP values

Question

Regex that somewhat validates if a value has one of the following characteristics:

123-29-123-123.subdomain.zomg.com:8085
123.12.34.56:420

Unfortunately, I'm terrible at Regex, C#, google searches, and the differences between proper nouns and regular ones.

It can be a lose approximation, in fact I would go with anything that has a : colon separator with a port after it.

Answer 1

Will this work?

^(?<Host>[^:]+)(?::(?<Port>\d+))?$

This gives me:

Host = 123-29-123-123.subdomain.zomg.com
Port = 8085

and

Host = 123.12.34.56:420
Port = 420