Yii2 - how to set url rule correctly?

Question

Yii

Hello, and actually - a subject.
There is a rule -

<categories/<id:\d+>/<slug:\w+> => 'categories/index'

, which works well for links like "example.com/categories/5/sport".
But if the 'slug' parameter consists of several parts, eg. 'music-and-movies', then the rule fails and redirects to a 404 page. But if in 'slug' the hyphen is replaced with an underscore, then everything works. What is the problem?
After all, as far as I understood from the documentation, '\w+' should understand hyphens too

Answer 1

If you are not friends with the regular season, do not use or learn. It can be like this:'categories/<id>/<slug>' => 'categories/index'

Answer 2

add a dash to the regular expression. something like slug:[\w-]+ or slug:[\w\-]+