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

        internal RegexNode ScanBackslash()
        {
            char ch;
            RegexCharClass cc;

            if (CharsRight() == 0)
                throw MakeException(SR.IllegalEndEscape);

            switch (ch = RightChar())
            {
                case 'b':
                case 'B':
                case 'A':
                case 'G':
                case 'Z':
                case 'z':
                    MoveRight();
                    return new RegexNode(TypeFromCode(ch), _options);

                case 'w':
                    MoveRight();
                    if (UseOptionE())
                        return new RegexNode(RegexNode.Set, _options, RegexCharClass.ECMAWordClass);
                    return new RegexNode(RegexNode.Set, _options, RegexCharClass.WordClass);

                case 'W':
                    MoveRight();
                    if (UseOptionE())
                        return new RegexNode(RegexNode.Set, _options, RegexCharClass.NotECMAWordClass);
                    return new RegexNode(RegexNode.Set, _options, RegexCharClass.NotWordClass);

                case 's':
                    MoveRight();
                    if (UseOptionE())
                        return new RegexNode(RegexNode.Set, _options, RegexCharClass.ECMASpaceClass);
                    return new RegexNode(RegexNode.Set, _options, RegexCharClass.SpaceClass);

                case 'S':
                    MoveRight();
                    if (UseOptionE())
                        return new RegexNode(RegexNode.Set, _options, RegexCharClass.NotECMASpaceClass);
                    return new RegexNode(RegexNode.Set, _options, RegexCharClass.NotSpaceClass);

                case 'd':
                    MoveRight();
                    if (UseOptionE())
                        return new RegexNode(RegexNode.Set, _options, RegexCharClass.ECMADigitClass);
                    return new RegexNode(RegexNode.Set, _options, RegexCharClass.DigitClass);

                case 'D':
                    MoveRight();
                    if (UseOptionE())
                        return new RegexNode(RegexNode.Set, _options, RegexCharClass.NotECMADigitClass);
                    return new RegexNode(RegexNode.Set, _options, RegexCharClass.NotDigitClass);

                case 'p':
                case 'P':
                    MoveRight();
                    cc = new RegexCharClass();
                    cc.AddCategoryFromName(ParseProperty(), (ch != 'p'), UseOptionI(), _pattern);
                    if (UseOptionI())
                        cc.AddLowercase(_culture);

                    return new RegexNode(RegexNode.Set, _options, cc.ToStringClass());

                default:
                    return ScanBasicBackslash();
            }
        }