using System;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		var str = "StopService::\r\n697::12::test::20::a@yahoo.com::20 Main Rd::Alcatraz::CA::1200::Please send me Information to\r\nA@gmail.com::0::::";
        var rgx = new Regex(@"(?<=^[^:]*::)[\r\n]+");
        Console.WriteLine(rgx.Replace(str, string.Empty));
	}
}