This plugin is working as advertised. It has some powerful features but it would be nice if it also supported a full regular expression syntax with a negation option. I assume the author didn’t want to over complicate the plugin, however.

Note: Some of the reviews complain that the plugin’s test tool doesn’t work. At first I started to experience a similar problem. Then I realized that the minimum length I had set was the reason. So, it was actually working exactly as configured.

Also, you must save your changes before testing. The test only runs against the saved changes. That is, you cannot update the configuration form and then run the test with expected results without saving first.