using System;
using System.IO;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
        string removed = string.Empty;
        string rest = ReFormat("PHOTO;TYPE=PNG;ENCODING=B:/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAMCAgMCAgMDAwMoHBwYIDAoMDAsK\r\nCwsNDhIQDQ4KL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx\r\nBhJB\r\nTEL;TYPE=CELL:123456789", out removed);
        Console.WriteLine(removed);
        Console.WriteLine(rest);
 
	}
	private static String ReFormat(String str, out String removed) 
        {
            Regex rgx = new Regex(@"(?msi)^(?<removed>PHOTO\b.*?)(?=\b(?:TEL|EMAIL|END)\b)"); 
            removed = rgx.Match(str).Groups["removed"].Value;
            return str.Replace(removed, string.Empty); 
        } 
}

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