Pihrtsoft.Text.RegularExpressions.Linq.PatternBuilder.AppendCharRange C# (CSharp) Метод

        internal void AppendCharRange(char firstChar, char lastChar)
        {
            Append(firstChar, true);
            AppendDirect('-');
            Append(lastChar, true);
        }

            protected override void AppendItemContentTo(PatternBuilder builder)
            {
                if (builder == null)
                    throw new ArgumentNullException(nameof(builder));

                builder.AppendCharRange(_firstChar, _lastChar);
            }