Index: django/core/validators.py
===================================================================
--- django/core/validators.py	(revision 15438)
+++ django/core/validators.py	(working copy)
@@ -40,7 +40,7 @@
 
 class URLValidator(RegexValidator):
     regex = re.compile(
-        r'^https?://' # http:// or https://
+        r'^(?:http|ftp)s?://' # http:// or https://
         r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?|' #domain...
         r'localhost|' #localhost...
         r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' # ...or ip