System.Text.RegularExpressions.RegexCharClass.AddLowercase C# (CSharp) Method

        internal void AddLowercase(CultureInfo culture) {
            int i;
            int origSize;
            SingleRange range;

            _canonical = false;

            for (i = 0, origSize = _rangelist.Count; i < origSize; i++) {
                range = (SingleRange)_rangelist[i];
                if (range._first == range._last)
                    range._first = range._last = Char.ToLower(range._first, culture);
                else
                    AddLowercaseRange(range._first, range._last, culture);
            }
        }

        internal String GetFirstChars(CultureInfo culture)
        {
            if (_caseInsensitive)
            {
                _cc.AddLowercase(culture);
            }

            return(_cc.ToStringClass());
        }