using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string attachmentFileName = "101135407.pdf";

        bool isAttachmentFileNameInvalid = IsAttachmentFileNameInvalid(attachmentFileName);

        Console.WriteLine(isAttachmentFileNameInvalid);

    }

    public static bool IsAttachmentFileNameInvalid(string attachmentFileName){

        //From hosting settings "UnacceptableScanNames"

        string unacceptableScanNamesInHostingSetting = "voorwaard, logo";

        List<string> unacceptableScanNames = unacceptableScanNamesInHostingSetting.Trim().Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries).ToList().ConvertAll(x => x.Trim().ToLowerInvariant());

        bool isMatch = unacceptableScanNames

            .Exists(x => Regex.IsMatch(attachmentFileName, x, RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.IgnorePatternWhitespace));

        return isMatch;

    }

}