diff --git a/activerecord/test/json_serialization_test.rb b/activerecord/test/json_serialization_test.rb
index eb4f90cf0f6f4f5a65c476b10bcebf6faac6aeea..3952a22c25d9bff4904f5a5725c935c2711cb733 100644
--- a/activerecord/test/json_serialization_test.rb
+++ b/activerecord/test/json_serialization_test.rb
@@ -23,7 +23,7 @@ def test_should_encode_all_encodable_attributes
 
     assert_match %r{"name": "Konata Izumi"}, json
     assert_match %r{"age": 16}, json
-    assert_match %r{"created_at": #{ActiveSupport::JSON.encode(Time.utc(2006, 8, 1))}}, json
+    assert json.include?(%("created_at": #{ActiveSupport::JSON.encode(Time.utc(2006, 8, 1))}))
     assert_match %r{"awesome": true}, json
     assert_match %r{"preferences": \{"shows": "anime"\}}, json
   end
@@ -34,7 +34,7 @@ def test_should_allow_attribute_filtering_with_only
     assert_match %r{"name": "Konata Izumi"}, json
     assert_match %r{"age": 16}, json
     assert_no_match %r{"awesome": true}, json
-    assert_no_match %r{"created_at": #{ActiveSupport::JSON.encode(Time.utc(2006, 8, 1))}}, json
+    assert !json.include?(%("created_at": #{ActiveSupport::JSON.encode(Time.utc(2006, 8, 1))}))
     assert_no_match %r{"preferences": \{"shows": "anime"\}}, json
   end
 
@@ -44,7 +44,7 @@ def test_should_allow_attribute_filtering_with_except
     assert_no_match %r{"name": "Konata Izumi"}, json
     assert_no_match %r{"age": 16}, json
     assert_match %r{"awesome": true}, json
-    assert_match %r{"created_at": #{ActiveSupport::JSON.encode(Time.utc(2006, 8, 1))}}, json
+    assert json.include?(%("created_at": #{ActiveSupport::JSON.encode(Time.utc(2006, 8, 1))}))
     assert_match %r{"preferences": \{"shows": "anime"\}}, json
   end
 
@@ -174,4 +174,4 @@ def test_should_allow_options_for_hash_of_authors
 
     assert_equal %({1: {"name": "David"}}), authors_hash.to_json(:only => [1, :name])
   end
-end
\ No newline at end of file
+end