FastColoredTextBoxNS.SyntaxHighlighter.PHPAutoIndentNeeded C# (CSharp) Method

        private void PHPAutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            /*
            FastColoredTextBox tb = sender as FastColoredTextBox;
            tb.CalcAutoIndentShiftByCodeFolding(sender, args);*/
            //block {}
            if (Regex.IsMatch(args.LineText, @"^[^""']*\{.*\}[^""']*$"))
                return;
            //start of block {}
            if (Regex.IsMatch(args.LineText, @"^[^""']*\{"))
            {
                args.ShiftNextLines = args.TabLength;
                return;
            }
            //end of block {}
            if (Regex.IsMatch(args.LineText, @"}[^""']*$"))
            {
                args.Shift = -args.TabLength;
                args.ShiftNextLines = -args.TabLength;
                return;
            }
            //is unclosed operator in previous line ?
            if (Regex.IsMatch(args.PrevLineText, @"^\s*(if|for|foreach|while|[\}\s]*else)\b[^{]*$"))
                if (!Regex.IsMatch(args.PrevLineText, @"(;\s*$)|(;\s*//)")) //operator is unclosed
                {
                    args.Shift = args.TabLength;
                }
        }