[FLOW3-general] How to secure a controller?

[Qbus | Axel Wüstemann]

> Make sure that your *initialize*Action()* is also accessible.
> You can do this like:
>
> resources:
>    methods:
>      Secure_Actions:
> 'method(Your\Package\Controller\(Foo|Bar)Controller->(?<!initialize).*Action())'
>
>
> HTH
>

What is "Foo|Bar" in this case? Is that a additional rule? Sorry, but 
I'm a bit confused now ;=)