diff --git a/apps/note/api/views.py b/apps/note/api/views.py
index d4021210..5096d238 100644
--- a/apps/note/api/views.py
+++ b/apps/note/api/views.py
@@ -1,5 +1,6 @@
 # Copyright (C) 2018-2021 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
+import re
 
 from django.conf import settings
 from django.db.models import Q
@@ -133,23 +134,31 @@ class ConsumerViewSet(ReadOnlyProtectedModelViewSet):
             if settings.DATABASES[queryset.db]["ENGINE"] == 'django.db.backends.postgresql' else queryset
 
         alias = self.request.query_params.get("alias", None)
+        # Check if this is a valid regex. If not, we won't check regex
+        try:
+            re.compile(alias)
+            valid_regex = True
+        except re.error:
+            valid_regex = False
+        suffix = '__iregex' if valid_regex else '__istartswith'
+        alias_prefix = '^' if valid_regex else ''
         queryset = queryset.prefetch_related('note')
 
         if alias:
             # We match first an alias if it is matched without normalization,
             # then if the normalized pattern matches a normalized alias.
             queryset = queryset.filter(
-                name__iregex="^" + alias
+                **{f'name{suffix}': alias_prefix + alias}
             ).union(
                 queryset.filter(
-                    Q(normalized_name__iregex="^" + Alias.normalize(alias))
-                    & ~Q(name__iregex="^" + alias)
+                    Q(**{f'normalized_name{suffix}': alias_prefix + Alias.normalize(alias)})
+                    & ~Q(**{f'name{suffix}': alias_prefix + alias})
                 ),
                 all=True).union(
                 queryset.filter(
-                    Q(normalized_name__iregex="^" + alias.lower())
-                    & ~Q(normalized_name__iregex="^" + Alias.normalize(alias))
-                    & ~Q(name__iregex="^" + alias)
+                    Q(**{f'normalized_name{suffix}': alias_prefix + alias.lower()})
+                    & ~Q(**{f'normalized_name{suffix}': alias_prefix + Alias.normalize(alias)})
+                    & ~Q(**{f'name{suffix}': alias_prefix + alias})
                 ),
                 all=True)