//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public static class Ext
    {
        public static string FindFirstNeedle(this string str, string[] needles, StringComparison comparison)
        {
            foreach (var needle in needles)
            {
                var i = str.IndexOf(needle, comparison);
                if (i >= 0)
                    return needle;
            }
            return null;
        }

        public static string[] SplitIgnoreCase(this string str, string[] separators)
        {
            var splits = new List<string>();
            var needle = str.FindFirstNeedle(separators, StringComparison.OrdinalIgnoreCase);
            while (needle != null)
            {
                var i = str.IndexOf(needle, StringComparison.OrdinalIgnoreCase);
                splits.Add(str.Substring(0, i));
                str = str.Substring(i + needle.Length);

                needle = str.FindFirstNeedle(separators, StringComparison.OrdinalIgnoreCase);
            }
            if (str.Length > 0)
            {
                splits.Add(str);
            }
            return splits.ToArray();
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            var str = "abXYcdxyefXyghKK,oo";
            var splits = str.SplitIgnoreCase(new [] {"xy", "kK"});
            Console.WriteLine(string.Join(",", splits));
        }
    }
}