Revert "refactor: avoid \x00 in regex validator"

This reverts commit 63f40cf

Author: jennifer-richards

ietf/doc/migrations/0026_alter_dochistory_title_alter_document_title.py

@@ -20,11 +20,7 @@
 from django.core import checks
 from django.core.files.base import File
 from django.core.cache import caches
-from django.core.validators import (
-    URLValidator,
-    RegexValidator,
-    ProhibitNullCharactersValidator,
-)
+from django.core.validators import URLValidator, RegexValidator
 from django.urls import reverse as urlreverse
 from django.contrib.contenttypes.models import ContentType
 from django.conf import settings
@@ -111,13 +107,7 @@ class DocumentInfo(models.Model):
     time = models.DateTimeField(default=timezone.now) # should probably have auto_now=True
 
     type = ForeignKey(DocTypeName, blank=True, null=True) # Draft, Agenda, Minutes, Charter, Discuss, Guideline, Email, Review, Issue, Wiki, External ...
-    title = models.CharField(
-        max_length=255,
-        validators=[
-            ProhibitNullCharactersValidator,
-            validate_no_control_chars,
-        ],
-    )
+    title = models.CharField(max_length=255, validators=[validate_no_control_chars, ])
 
     states = models.ManyToManyField(State, blank=True) # plain state (Active/Expired/...), IESG state, stream state
     tags = models.ManyToManyField(DocTagName, blank=True) # Revised ID Needed, ExternalParty, AD Followup, ...

ietf/doc/models.py

@@ -33,9 +33,8 @@
 # Note that this is an instantiation of the regex validator, _not_ the
 # regex-string validator defined right below
 validate_no_control_chars = RegexValidator(
-    regex="^[^\x01-\x1f]*$",
-    message="Please enter a string without control characters.",
-)
+                                    regex="^[^\x00-\x1f]*$",
+                                    message="Please enter a string without control characters." )
 
 
 @deconstructible