System.Net.ServiceNameStore.ExtractHostname C# (CSharp) Метод

        private string ExtractHostname(string uriPrefix, bool allowInvalidUriStrings)
        {
            if (Uri.IsWellFormedUriString(uriPrefix, UriKind.Absolute))
            {
                Uri hostUri = new Uri(uriPrefix);
                return hostUri.Host;
            }
            else if (allowInvalidUriStrings)
            {
                int i = uriPrefix.IndexOf("://") + 3;
                int j = i;

                bool inSquareBrackets = false;
                while (j < uriPrefix.Length && uriPrefix[j] != '/' && (uriPrefix[j] != ':' || inSquareBrackets))
                {
                    if (uriPrefix[j] == '[')
                    {
                        if (inSquareBrackets)
                        {
                            j = i;
                            break;
                        }
                        inSquareBrackets = true;
                    }
                    if (inSquareBrackets && uriPrefix[j] == ']')
                    {
                        inSquareBrackets = false;
                    }
                    j++;
                }

                return uriPrefix.Substring(i, j - i);
            }

            return null;
        }