using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        string x = @"================ 09.01.2017 [8:51:11] created by VBScript ================

​

   ....some text

​

============================= END =============================

​

================ 16.01.2017 [9:49:09] created by VBScript ================

​

   ....some text

​

============================= END =============================

​

================ 18.01.2017 [8:43:50] created by VBScript ================

​

    ....some text

​

============================= END =============================";

         string[] stringSeparators = {"\n"};

 List<string> lines = x.Split(stringSeparators, StringSplitOptions.None).ToList();

​

        var myQuery = lines.Select((l,idx) => new {idx =idx, body = l}).Where(m => m.body.StartsWith("=") && m.body.EndsWith("="));

        foreach(var m in myQuery)

        {

            Console.WriteLine(m.idx + " : " + m.body);

        }

    }

}