using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        string pattern  = @"(?s)#{(.*?)*}#";

        string strInputMultiple = "#{{<div class=\"\">{{Meth[#0#]}}</div>}}#" +

                            "<div class=\"form-group form-col-2\">" +

                                "#{{<div class=\"form-group-inline\">" +

                                    "<label>{{ABCDEF}}</label>" +

                                    "<div class=\"inpt\">" +

                                    "{{??DropList??}}   " +

                                    "{{??DropList??}}" +

                                    "</div>" +

                                "</div>}}#   " +                                     

                            "</div>" +

                            "<div class=\"form-group form-col-2\">" +

                                "#{{<div class=\"form-group-inline\">" +

                                    "<label>{{DEFGHI}}</label>" +

                                    "<div class=\"inpt\">" +

                                    "{{??DropList??}}" +

                                    "{{??DropList??}}" +

                                    "</div>" +

                                "</div>}}#   " +                                    

                            "</div>";

        MatchCollection matches = Regex.Matches(strInputMultiple, pattern);

        foreach (Match m in matches)

        {

            foreach (Capture capture in m.Captures)

            {

                Console.WriteLine(capture.Value.Replace("\"",""));

            }

        }

​

    }

}