Google.SafeBrowsing.API.IsIpAddress C# (CSharp) 메소드

        private bool IsIpAddress(string hostname)
        {
            Regex reg = new Regex(@"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$");

            return reg.IsMatch(hostname);
        }