Fixed #16166 - `EmailField` does not comply with SMTP standard

Thanks to qqq1one@yahoo.com for the report, and samufuentes for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16355 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/validators.py

@@ -135,7 +135,8 @@ class EmailValidator(RegexValidator):
 email_re = re.compile(
     r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*"  # dot-atom
     r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*"' # quoted-string
-    r')@(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?$', re.IGNORECASE)  # domain
+    r')@((?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?$)'  # domain
+    r'|\[(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\]$', re.IGNORECASE)  # literal form, ipv4 address (SMTP 4.1.3)
 validate_email = EmailValidator(email_re, _(u'Enter a valid e-mail address.'), 'invalid')
 
 slug_re = re.compile(r'^[-\w]+$')

tests/modeltests/validators/tests.py

@@ -22,12 +22,14 @@ TEST_DATA = (
 
     (validate_email, 'email@here.com', None),
     (validate_email, 'weirder-email@here.and.there.com', None),
+    (validate_email, 'email@[127.0.0.1]', None),
 
     (validate_email, None, ValidationError),
     (validate_email, '', ValidationError),
     (validate_email, 'abc', ValidationError),
     (validate_email, 'a @x.cz', ValidationError),
     (validate_email, 'something@@somewhere.com', ValidationError),
+    (validate_email, 'email@127.0.0.1', ValidationError),
 
     (validate_slug, 'slug-ok', None),
     (validate_slug, 'longer-slug-still-ok', None),