using System;

public class Program

{

    public static void Main()

    {

        string xml_text = "<test><message type=\"text\">Received _EmmMsgIdentityResponse IMEI 35645138976381</message></test>";

        string[] stringSeparators = new string[] { "_EmmMsgIdentityResponse IMEI " };

        string[] result;

        result = xml_text.Split(stringSeparators, StringSplitOptions.None);

        int i = 0;

        for (i = 0; i < result.Length; i++){

            Console.WriteLine(result[i]);

        }

    }

}