Jackett-Jackett/src/Jackett/Utils/StringUtil.cs

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

namespace Jackett.Utils
{
    public static class StringUtil
    {
        public static string StripNonAlphaNumeric(string str)
        {
            Regex rgx = new Regex("[^a-zA-Z0-9 -]");
            str = rgx.Replace(str, "");
            return str;
        }

        public static string FromBase64(string str)
        {
            return Encoding.UTF8.GetString(Convert.FromBase64String(str));
        }

    }
}