Remove Illegal Chars from a File and/or Folder Name

Introduction

When you wish to check a new name for a folder or file, you perform a validate function. This function may vary according to the implementer.

Most of us will just write down a simple function to remove the illegal chars such as < > : " / \ | ? * (on Windows) like replacing those chars with "" e.g.:

Str = Str.Replace("<", "");  

However, you are missing a lot of uncommon chars that are not allowed, (many of which you don't have on your keyboard [even in China!]) and (though somewhat unlikely) those may even vary with time. The idea is to use the .NET-provided illegal chars of the Path class, and to replace them with Regex.

Code

Here goes:

public static string FixedStr(string Str)
{
    // This regex will include illegal chars you never dreamed of
    string illegalCharsPattern = new string(Path.GetInvalidFileNameChars()) 
         + new string(Path.GetInvalidPathChars());
    Regex r = new Regex(string.Format("[{0}]", Regex.Escape(illegalCharsPattern))); 
    return r.Replace(Str, ""); 
}  

NOTE: This is not for old systems with SFN 8.3 file name requirement (like FAT), for file names and some special UNIX systems (though UNIX usually allows most chars).