File Rename für Sharepoint

$rootfolder = 'D:\Daten'  
$regex = '(\.files|_files|\-Dateien|_fichiers|_bestanden|_file|_archivos|\-Filer|_tiedostot|_pliki|_soubory|_elemei|_ficheiros|_arquivos|_dosyalar|_datoteke|_fitxers|_failid|_fails|_bylos|_fajlovi|_fitxategiak)$|^_vti_|\.{2,}|\.$|^\.|^_|[\\/:?<>|"*~#%&{}+]'  
gci $rootfolder -Force -Recurse -PipelineVariable obj | ?{$_.Name -match $regex} | sort {$_.Fullname.length} -Desc | %{
     $newname = $_.Name -replace $regex,''  
     while($newname -match $regex){$newname = $newname -replace $regex,''}  
     $cnt = 1
     if ($newname -match '^\s*$'){  
        $getnewname = { @{$true="folder";$false="file"}[$obj.PSIsContainer] + "_$cnt" }  
        $newname = . $getnewname
        while(Test-Path "$([IO.Path]::GetDirectoryName($_.Fullname))\$newname"){$cnt++;$newname = .$getnewname}  
     }else{
        $getnewname = { $newname + "_$cnt" }  
        while(Test-Path "$([IO.Path]::GetDirectoryName($_.Fullname))\$newname"){$cnt;$newname = .$getnewname}  
     }
     $_ | rename-item -NewName $newname -verbose -whatif
}