System.Text.RegularExpressions.RegexParser.ScanOctal C# (CSharp) Method

        internal char ScanOctal()
        {
            int d;
            int i;
            int c;

            // Consume octal chars only up to 3 digits and value 0377

            c = 3;

            if (c > CharsRight())
                c = CharsRight();

            for (i = 0; c > 0 && (uint)(d = RightChar() - '0') <= 7; c -= 1)
            {
                MoveRight();
                i *= 8;
                i += d;
                if (UseOptionE() && i >= 0x20)
                    break;
            }

            // Octal codes only go up to 255.  Any larger and the behavior that Perl follows
            // is simply to truncate the high bits.
            i &= 0xFF;

            return (char)i;
        }