diff --git a/README.markdown b/README.markdown
index 2d933fa..290566e 100644
--- a/README.markdown
+++ b/README.markdown
@@ -349,6 +349,12 @@ to one of the values specified in the url allowlist like so:
 DatabaseCleaner.url_allowlist = ['postgres://postgres@localhost', 'postgres://foo@bar']
 ```
 
+Allowlist elements may be specified as regular expressions if extra flexibility is required::
+
+```ruby
+DatabaseCleaner.url_allowlist = [%r{^postgres://postgres@localhost}]
+```
+
 ## COPYRIGHT
 
 See [LICENSE](LICENSE) for details.
diff --git a/spec/database_cleaner/safeguard_spec.rb b/spec/database_cleaner/safeguard_spec.rb
index 3a24721..20b7993 100644
--- a/spec/database_cleaner/safeguard_spec.rb
+++ b/spec/database_cleaner/safeguard_spec.rb
@@ -86,7 +86,7 @@ module DatabaseCleaner
           describe 'A remote url is not on the allowlist' do
             let(:database_url) { 'postgress://bar.baz' }
 
-            it 'raises a allowlist error' do
+            it 'raises a not allowed error' do
               expect { cleaner.start }.to raise_error(Safeguard::Error::UrlNotAllowed)
             end
           end
@@ -94,7 +94,7 @@ module DatabaseCleaner
           describe 'A similar url not explicitly matched as a pattern' do
             let(:database_url) { 'postgres://foo.bar?pool=8' }
 
-            it 'raises an allowlist error' do
+            it 'raises a not allowed error' do
               expect { cleaner.start }.to raise_error(Safeguard::Error::UrlNotAllowed)
             end
           end