Merge branch 'fix/import-regexvalidator' into 'master'

Import RegexValidator

See merge request !23

bigbluebutton/django/models.py

@@ -10,6 +10,7 @@ import uuid
 
 from django.contrib.sites.managers import CurrentSiteManager
 from django.contrib.sites.models import Site
+from django.core.validators import RegexValidator
 from django.core.exceptions import ValidationError
 from django.db import models
 from django.utils.translation import gettext_lazy as _