using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

    String[] columns = Regex.Split("\"0\",\"Column\",\"column2\",\"Column3\"", @"[^\s""']+|""([^""]*)""|'([^']*)");

​

        Console.WriteLine(columns.Length);

        Console.WriteLine(string.Join(",", columns));

    }

}