diff --git a/contest/validators.py b/contest/validators.py
index 709c2aa..22b5f95 100644
--- a/contest/validators.py
+++ b/contest/validators.py
@@ -9,7 +9,7 @@ import re
 @deconstructible
 class CallUsernameValidator(validators.RegexValidator):
     #regex = r'^[\w.@+-]+$'
-    regex = r'^(?:[A-Z]+/)?[A-Z]{1,2}[0-9][A-Z]{1,4}(?:/[A-Z])?$'
+    regex = r'^(?:[A-Z]+/)?[A-Z]{1,2}[0-9][A-Z]{1,4}(?:-[0-9])?(?:/p)?$'
     message = _(
         'Enter a valid Callsign as Username, ALL UPPERCASE, if needed with /A /B,'
         'e.g. DL7BST, DN1BER/A, DL/OE1FOO'