Regex for IP address

Question

I tried this code for validating IP address, but it doesn\'t work...

public static bool IP(string ipStr)
{
    string pattern = @\"^([1-9]|[1-9][0-9]|1[0-9][         


        

Answer 1

For CIDR format in both ipv4 and ipv6

http://blog.markhatton.co.uk/2011/03/15/regular-expressions-for-ip-addresses-cidr-ranges-and-hostnames/