diff --git a/django/core/validators.py b/django/core/validators.py
index 78716ccd40..378da27498 100644
--- a/django/core/validators.py
+++ b/django/core/validators.py
@@ -42,7 +42,7 @@ class RegexValidator(object):
 class URLValidator(RegexValidator):
     regex = re.compile(
         r'^(?:http|ftp)s?://'  # http:// or https://
-        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|'  # domain...
+        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}(?<!-)\.?)|'  # domain...
         r'localhost|'  # localhost...
         r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|'  # ...or ipv4
         r'\[?[A-F0-9]*:[A-F0-9:]+\]?)'  # ...or ipv6
@@ -85,7 +85,7 @@ class EmailValidator(object):
         r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013\014\016-\177])*"$)', # quoted-string
         re.IGNORECASE)
     domain_regex = re.compile(
-        r'(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}|[A-Z0-9-]{2,})\.?$'  # domain
+        r'(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}|[A-Z0-9-]{2,}(?<!-))$'
         # literal form, ipv4 address (SMTP 4.1.3)
         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)
diff --git a/tests/validators/tests.py b/tests/validators/tests.py
index 8d21ddea79..53157297c4 100644
--- a/tests/validators/tests.py
+++ b/tests/validators/tests.py
@@ -44,6 +44,7 @@ TEST_DATA = (
     (validate_email, 'email@127.0.0.1', ValidationError),
     (validate_email, 'example@invalid-.com', ValidationError),
     (validate_email, 'example@-invalid.com', ValidationError),
+    (validate_email, 'example@invalid.com-', ValidationError),
     (validate_email, 'example@inv-.alid-.com', ValidationError),
     (validate_email, 'example@inv-.-alid.com', ValidationError),
     (validate_email, 'test@example.com\n\n<script src="x.js">', ValidationError),
@@ -153,6 +154,7 @@ TEST_DATA = (
     (URLValidator(), 'http://.com', ValidationError),
     (URLValidator(), 'http://invalid-.com', ValidationError),
     (URLValidator(), 'http://-invalid.com', ValidationError),
+    (URLValidator(), 'http://invalid.com-', ValidationError),
     (URLValidator(), 'http://inv-.alid-.com', ValidationError),
     (URLValidator(), 'http://inv-.-alid.com', ValidationError),