using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var target = "AAA[xx]BBB[yyyy]CCC[zzz]DDD";

        var inputs = new List<string>{

            "[xx]",

            "[yyyy]",

            "[zzz]"

        };

        var result=new List<string>{target};

        foreach(var input in inputs){

            result=getSplit(input, result);

        }   

        foreach(var r in result){

            System.Console.WriteLine(r);

        }       

    }

    public static List<string> getSplit(string pattern, List<string> result){

        var newResult=new List<string>();

        foreach(var r in result){

            var subs = Regex.Split(r,@"("+pattern.Replace("[","\\[").Replace("]","\\]")+")");

            foreach(var sub in subs){

                newResult.Add(sub);

            }

        }

        return newResult;

    }

}