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

        internal void AddAlternate()
        {
            // The | parts inside a Testgroup group go directly to the group

            if (_group.Type() == RegexNode.Testgroup || _group.Type() == RegexNode.Testref)
            {
                _group.AddChild(_concatenation.ReverseLeft());
            }
            else
            {
                _alternation.AddChild(_concatenation.ReverseLeft());
            }

            _concatenation = new RegexNode(RegexNode.Concatenate, _options);
        }