Regex to match 2 level deep URL and not 3 level deep (Google Analytics)

We can say "not the following characters" using [^...] the ^ stands for "not". So to restrict the levels we can use [^/].

Here some examples:

Match /sport/something : ^/sport/[^/]+$

Has to start with / and then exactly 1 / has to follow: ^/[^/]+/[^/]+$ or ^(/[^/]+){2}$

Generalized for start with / and followed by 4 / at most: ^(/[^/]+){1,5}$