RegEx for an IP Address

Question

I try to extract the value (IP Address) of the wan_ip with this sourcecode: Whats wrong?! I´m sure that the RegEx pattern is correct.

String input = @\"var p         


        

Answer 1

I took this pattern from UrlAttribute.cs. at DataAnnotations namespace. As you may see, I took just a piece of the original pattern from source.

Regex.IsMatch(input, @"^(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-
9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-
9]\d|1\d\d|2[0-4]\d|25[0-5])$");