using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var input ="[[[\"Bonjour, Ceci est un \\\"test\\\"!\",\"Hello, This is a test!\",,,0]],,\"en\"]";     

        Parse(input).Dump();

    }

    // Define other methods and classes here

    private static IEnumerable<string> Parse(string input) {

        bool inToken = false;

        bool inString = false;

        bool escaped = false;

        var seps = ",[]\"".ToArray();

        var current = "";

        foreach (var chr in input) {

            if (!inString && chr == '"') {

                current = "";

                inString = true;

                continue;

            }

            if (inString && !escaped && chr == '"') {

                yield return current;

                current = "";

                inString = false;

                continue;

            }

            if (inString && !escaped && chr == '\\') {

                escaped = true;

                continue;

            }

            if (inString && (chr != '"' || escaped)) {

                escaped = false;

                current += chr;

                continue;

            }

            if (inToken && seps.Contains(chr)) {

                yield return current;

                current = "";

                inToken = false;

                continue;

            }

            if (!inString && chr == '"') {

                inString = true;

                current = "";

                continue;

            }

            if (!inToken && !seps.Contains(chr)) {

                inToken = true;

                current = "";

            }

            current += chr;

        }

    }

}