diff --git a/registrierung_erfolgreich.php b/registrierung_erfolgreich.php
index e2f105a..a077e7e 100644
--- a/registrierung_erfolgreich.php
+++ b/registrierung_erfolgreich.php
@@ -35,8 +35,8 @@ if(isset($_POST['Registrieren'])){
     || !preg_match("/^([A-ZÄÖÜa-zäöüß]{2,}[ -]?)+$/", $nachname)
     || !preg_match("/[a-zäöüß]$/", $nachname)
     || preg_match("/[A-ZÄÖÜ][a-zäöüß]+[ ]+[A-ZÄÖÜ][a-zäöüß]+/", $nachname)
-    || !preg_match("/^(von( der)?|zu)[ ][A-ZÄÖÜ]|^[A-ZÄÖÜ]/", $nachname)
-    || !preg_match("/(^(von( der)?|zu)[ ][A-ZÄÖÜ][a-zäöüß]+|^[A-ZÄÖÜ][a-zäöüß]+)([-][A-ZÄÖÜ][a-zäöüß]+)?$/", $nachname)
+    || !preg_match("/^(von( der)?|zu|van)[ ][A-ZÄÖÜ]|^[A-ZÄÖÜ]/", $nachname)
+    || !preg_match("/(^(von( der)?|zu|van)[ ][A-ZÄÖÜ][a-zäöüß]+|^[A-ZÄÖÜ][a-zäöüß]+)([-][A-ZÄÖÜ][a-zäöüß]+)?$/", $nachname)
     || preg_match("/(\w)\1{2,}/", $nachname)) {
         
         header("Location: registrierung_wiederholen.html");