System.Uri.CheckForEscapedUnreserved C# (CSharp) Method

        private unsafe bool CheckForEscapedUnreserved(string data)
        {
            fixed (char* tempPtr = data)
            {
                for (int i = 0; i < data.Length - 2; ++i)
                {
                    if (tempPtr[i] == '%' && UriHelper.IsHexDigit(tempPtr[i + 1]) && UriHelper.IsHexDigit(tempPtr[i + 2])
                        && tempPtr[i + 1] >= '0' && tempPtr[i + 1] <= '7') // max 0x7F
                    {
                        char ch = UriHelper.EscapedAscii(tempPtr[i + 1], tempPtr[i + 2]);
                        if (ch != c_DummyChar && UriHelper.Is3986Unreserved(ch))
                        {
                            return true;
                        }
                    }
                }
            }
            return false;
        }