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

        internal int ScanDecimal()
        {
            int i = 0;
            int d;

            while (CharsRight() > 0 && (uint)(d = (char)(RightChar() - '0')) <= 9)
            {
                MoveRight();

                if (i > (MaxValueDiv10) || (i == (MaxValueDiv10) && d > (MaxValueMod10)))
                    throw MakeException(SR.CaptureGroupOutOfRange);

                i *= 10;
                i += d;
            }

            return i;
        }