using System;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var test = new Regex("\\s+").Replace( @"   This is a text   : This is my first line of information

                      which continues here

                    : This is my second line of information

                      which continues here

                    : This is my third line of information

                      which continues here",  " ").Split(':').Where((s,i) => i != 0).Select(s=>s.Trim());

        test.Dump();

    }

}