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

        internal void AddDigit(bool ecma, bool negate, string pattern) {
            if (ecma) {
                if (negate) 
                    AddSet(RegexCharClass.NotECMADigitSet);
                else
                    AddSet(RegexCharClass.ECMADigitSet);
            }
            else
                AddCategoryFromName("Nd", negate, false, pattern);
        }