//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[] SplitIgnoreCase(this string str, char[] separators)
        {
            var splits = new List<string>();
            var lastIndex = 0;
            for (int i = 0; i < str.Length; i++)
            {
                if (separators.Any(c => char.ToLowerInvariant(c) == char.ToLowerInvariant(str[i])))
                {
                    splits.Add(str.Substring(lastIndex, i - lastIndex));
                    lastIndex = i + 1;
                }
                else if (i == str.Length - 1)
                {
                    splits.Add(str.Substring(lastIndex));
                }
            }
            return splits.ToArray();
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            var str = "abXcdXefxgh";
            var splits = str.SplitIgnoreCase(new [] {'x'});
            Console.WriteLine(string.Join(",", splits));
        }
    }
}