using System;
using System.Linq;
using System.Text.RegularExpressions;
using System.IO;
public class Test
{
	public static void Main()
	{
		var s = "hello;there;;you;;;!;";
		var res = Regex.Split(s, @";(?!;)").Where(m => !string.IsNullOrEmpty(m));
		Console.WriteLine(string.Join(", ", res));
 
		var s1 = "a;b;;";
		var res1 = Regex.Split(s1, @";(?!;)").Where(m => !string.IsNullOrEmpty(m)).ToList();
		Console.WriteLine(string.Join(", ", res1));
	}
 
}

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