diff --git a/netbox/dcim/querysets.py b/netbox/dcim/querysets.py
index 69dbf99dc..3e977ddc6 100644
--- a/netbox/dcim/querysets.py
+++ b/netbox/dcim/querysets.py
@@ -44,10 +44,10 @@ class InterfaceQuerySet(QuerySet):
 
         TYPE_RE = r"SUBSTRING({} FROM '^([^0-9]+)')"
         ID_RE = r"CAST(SUBSTRING({} FROM '^(?:[^0-9]+)([0-9]+)$') AS integer)"
-        SLOT_RE = r"CAST(SUBSTRING({} FROM '^(?:[^0-9]+)([0-9]+)\/') AS integer)"
-        SUBSLOT_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)(?:[0-9]+\/)([0-9]+)') AS integer), 0)"
-        POSITION_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)(?:[0-9]+\/){{2}}([0-9]+)') AS integer), 0)"
-        SUBPOSITION_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)(?:[0-9]+\/){{3}}([0-9]+)') AS integer), 0)"
+        SLOT_RE = r"CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?([0-9]+)\/') AS integer)"
+        SUBSLOT_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?(?:[0-9]+\/)([0-9]+)') AS integer), 0)"
+        POSITION_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?(?:[0-9]+\/){{2}}([0-9]+)') AS integer), 0)"
+        SUBPOSITION_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?(?:[0-9]+\/){{3}}([0-9]+)') AS integer), 0)"
         CHANNEL_RE = r"COALESCE(CAST(SUBSTRING({} FROM ':([0-9]+)(\.[0-9]+)?$') AS integer), 0)"
         VC_RE = r"COALESCE(CAST(SUBSTRING({} FROM '\.([0-9]+)$') AS integer), 0)"