diff --git a/src/Entity/UserSystem/User.php b/src/Entity/UserSystem/User.php
index 4ecce298..c8ae0f8a 100644
--- a/src/Entity/UserSystem/User.php
+++ b/src/Entity/UserSystem/User.php
@@ -218,6 +218,7 @@ class User extends AttachmentContainingDBElement implements UserInterface, HasPe
     /**
      * @ORM\Column(type="string", length=180, unique=true)
      * @Assert\NotBlank
+     * @Assert\Regex("/^[\w\.\+\-\$]+$/", message="user.invalid_username")
      */
     protected $name = '';
 
diff --git a/translations/validators.de.xlf b/translations/validators.de.xlf
index 57d20110..115c88c9 100644
--- a/translations/validators.de.xlf
+++ b/translations/validators.de.xlf
@@ -976,5 +976,11 @@
         <target>Der Lagerort wurde als "Nur ein Bauteil" markiert, daher kann kein neues Bauteil hinzugefügt werden.</target>
       </segment>
     </unit>
+    <unit id="NcM463r" name="user.invalid_username">
+      <segment>
+        <source>user.invalid_username</source>
+        <target>Der Benutzername darf nur Buchstaben, Zahlen, Unterstriche, Punkte, Plus- oder Minuszeichen enthalten.</target>
+      </segment>
+    </unit>
   </file>
 </xliff>
diff --git a/translations/validators.en.xlf b/translations/validators.en.xlf
index 479d06c8..a4609071 100644
--- a/translations/validators.en.xlf
+++ b/translations/validators.en.xlf
@@ -976,5 +976,11 @@
         <target>The storage location was marked as "single part", so you can not add a new part to it.</target>
       </segment>
     </unit>
+    <unit id="NcM463r" name="user.invalid_username">
+      <segment>
+        <source>user.invalid_username</source>
+        <target>The username must contain only letters, numbers, underscores, dots, pluses or minuses.</target>
+      </segment>
+    </unit>
   </file>
 </xliff>