I'm trying to write a simple PHP function that can take a string like

`Topic: Some stuff, Maybe some more, it's my stuff?`

and return

`topic-some-stuff-maybe-some-more-its-my-stuff`

As such:

* lowercase
* remove all non-alphanumeric non-space characters
* replace all spaces (or groups of spaces) with hyphens

Can I do this with a single regex?