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

        internal string ParseProperty()
        {
            if (CharsRight() < 3)
            {
                throw MakeException(SR.IncompleteSlashP);
            }
            char ch = MoveRightGetChar();
            if (ch != '{')
            {
                throw MakeException(SR.MalformedSlashP);
            }

            int startpos = Textpos();
            while (CharsRight() > 0)
            {
                ch = MoveRightGetChar();
                if (!(RegexCharClass.IsWordChar(ch) || ch == '-'))
                {
                    MoveLeft();
                    break;
                }
            }
            string capname = _pattern.Substring(startpos, Textpos() - startpos);

            if (CharsRight() == 0 || MoveRightGetChar() != '}')
                throw MakeException(SR.IncompleteSlashP);

            return capname;
        }