diff --git a/CHANGES.txt b/CHANGES.txt
index a177dae..95a4c01 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,11 @@
+Next release
+------------
+
+Features
+~~~~~~~~
+
+- Add ``colander.ContainsOnly`` and ``colander.url`` validators.
+
 1.0a1 (2013-01-10)
 ------------------
 
diff --git a/colander/__init__.py b/colander/__init__.py
index 5397336..f7bb024 100644
--- a/colander/__init__.py
+++ b/colander/__init__.py
@@ -1,3 +1,5 @@
+# coding=utf-8
+
 import datetime
 import decimal
 import time
@@ -356,6 +358,24 @@ class OneOf(object):
                     mapping={'val':value, 'choices':choices})
             raise Invalid(node, err)
 
+class ContainsOnly(object):
+    """ Validator which succeeds if the value passed to is a sequence and each
+    element in the sequence is also in the sequence passed as ``acceptable``
+    """
+    err_template = _(
+        'One or more of the choices you made was not acceptable'
+        )
+    def __init__(self, acceptable):
+        self.acceptable = set(acceptable)
+
+    def __call__(self, node, value):
+        if not set(value).issubset(self.acceptable):
+            err = _(
+                self.err_template,
+                mapping = {'val':value, 'acceptable':self.acceptable}
+                )
+            raise Invalid(node, err)
+
 def luhnok(node, value):
     """ Validator which checks to make sure that the value passes a luhn
     mod-10 checksum (credit cards).  ``value`` must be a string, not an
@@ -386,6 +406,10 @@ def _luhnok(value):
         sum = sum + digit
     return sum
 
+URL_REGEX = r"""(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))""" # "emacs!
+
+url = Regex(URL_REGEX, _('Must be a URL'))
+
 class SchemaType(object):
     """ Base class for all schema types """
     def flatten(self, node, appstruct, prefix='', listitem=False):
diff --git a/colander/tests/test_colander.py b/colander/tests/test_colander.py
index 695978f..6f962dc 100644
--- a/colander/tests/test_colander.py
+++ b/colander/tests/test_colander.py
@@ -408,6 +408,30 @@ class TestOneOf(unittest.TestCase):
         e = invalid_exc(validator, None, None)
         self.assertEqual(e.msg.interpolate(), '"None" is not one of 1, 2')
 
+class TestContainsOnly(unittest.TestCase):
+    def _makeOne(self, values):
+        from colander import ContainsOnly
+        return ContainsOnly(values)
+
+    def test_success(self):
+        validator = self._makeOne([1])
+        self.assertEqual(validator(None, [1]), None)
+
+    def test_failure(self):
+        validator = self._makeOne([1])
+        e = invalid_exc(validator, None, [2])
+        self.assertEqual(
+            e.msg.interpolate(),
+            'One or more of the choices you made was not acceptable'
+            )
+
+    def test_failure_with_custom_error_template(self):
+        validator = self._makeOne([1])
+        from colander import _
+        validator.err_template = _('${val}: ${acceptable}')
+        e = invalid_exc(validator, None, [2])
+        self.assertTrue('[2]' in e.msg.interpolate())
+
 class Test_luhnok(unittest.TestCase):
     def _callFUT(self, node, value):
         from colander import luhnok
@@ -432,6 +456,21 @@ class Test_luhnok(unittest.TestCase):
         val = '4111111111111111'
         self.assertFalse(self._callFUT(None, val))
 
+class Test_url_validator(unittest.TestCase):
+    def _callFUT(self, val):
+        from colander import url
+        return url(None, val)
+
+    def test_it_success(self):
+        val = 'http://example.com'
+        result = self._callFUT(val)
+        self.assertEqual(result, None)
+        
+    def test_it_failure(self):
+        val = 'not-a-url'
+        from colander import Invalid
+        self.assertRaises(Invalid, self._callFUT, val)
+
 class TestSchemaType(unittest.TestCase):
     def _makeOne(self, *arg, **kw):
         from colander import SchemaType
diff --git a/docs/api.rst b/docs/api.rst
index c8471ae..2562d94 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -59,6 +59,8 @@ Validators
 
   .. autoclass:: OneOf
 
+  .. autoclass:: ContainsOnly
+
   .. autoclass:: Function
 
   .. autoclass:: Regex
@@ -67,6 +69,10 @@ Validators
 
   .. autofunction:: luhnok
 
+  .. attribute:: url
+ 
+     A validator which ensures the value is a URL (via regex).
+
 Types
 ~~~~~