regex 'reduce path' & y/n question

main.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
//using Sharpduino;
//using Sharpduino.Constants;

namespace ConsoleApplication1
{
    class Program
    {
        static string regex_extract(string input, string pattern, RegexOptions regex_options = RegexOptions.None, int group = 1)
        {
            var match = Regex.Match(input, pattern, regex_options);
            if (match.Success) return match.Groups[group].ToString();
            return "";
        }
        static void Main(string[] args)
        {

            var key = @"C:\whatever\neno\neno\views\myneno\welcome.cshtml";
            Console.WriteLine(regex_extract(key, @"\\[^\\]*\\[^\\]*\\[^\\]*\\[^\\]*$", group: 0));
            Console.Write("Fix (y/n)");
            var yn = Console.ReadKey().KeyChar.ToString().ToLower();
            if (yn == "y" || yn == "j")
            {
                Console.WriteLine("yes");
            }
            Console.ReadKey();
        }
    }
}