SharePoint File and Folder Name validation

Here is a quick sample on how you can validate a file or folder name before creating/uploading it in SharePoint.
Scenario in which I used this code block when I am creating a folder hierarchy in SharePoint site (on-premises or online) based on a database query and migrating files.
Based on the KB 905231, there are following characters are not allowed in the file/folder name for SharePoint.

• Tilde (~)
• Number sign (#)
• Percent (%)
• Ampersand (&)
• Asterisk (*)
• Braces ({ })
• Backslash (\)
• Colon (:)
• Angle brackets (< >)
• Question mark (?)
• Slash (/)
• Plus sign (+)
• Pipe (|)
• Quotation mark (")

Along with those, you have to check below conditions also:

• You cannot use the period character consecutively in the middle of a file name.
• You cannot use the period character at the end of a file name.
• You cannot start a file name by using the period character.
• If you use an underscore character (_) at the beginning of a file name, the file will be a hidden file.

Extra conditions:

In addition, file names and folder names may not end with any of the following strings:

• .files
• _files
• -Dateien
• _fichiers
• _bestanden
• _file
• _archivos
• -filer
• _tiedostot
• _pliki
• _soubory
• _elemei
• _ficheiros
• _arquivos
• _dosyalar
• _datoteke
• _fitxers
• _failid
• _fails
• _bylos
• _fajlovi
• _fitxategiak

In My code block, I am not considering the extra conditions.
You can pass the required file/folder name which need to be validated to the function, and function will let you know if that is a valid name.

public static bool NameValidate(string strName)
{
bool isValidFileName = true;
var match = (new Regex("[ ~ # % & * { } : < > ? / + | \" \\\\ ]|\\.\\.|^\\.|^[_]|\\.$")).IsMatch(strName);
if (match)
{

//Invalid file name.

isValidFileName = false;

}
else
{
    //Valid file name.
}
return isValidFileName;
}

Else you can also use below options if you have to replace each occurrence of characters and fix the name –
char[] filenameChars = fileORFolderName.ToCharArray();
     foreach (char c in filenameChars)
     {
         if (!SPEncode.IsLegalCharInUrl(c))
fileORFolderName = fileORFolderName.Replace(c.ToString(), "");
     }

 In above the reg ex can be broken as:

[ ~ # % & * { } : < > ? / + | \" \\\\ ]	Any one of the chars anywhere in the name (last \\\\ represent one backslash \)
\\.\\.	. .( double Dot) consecutive dot occurring in the name
^\\.	. (Dot) at the start of name
^[_]	_(underscore) in the beginning of name
\\.$	. (Dot) at the end of name

Feel free to share your comments.