Valid statement in pf.conf?

[Doug Van Allen]

Is this valid:

<b>pass  in  on $ext_if proto tcp from 151.103.xxx.xxx-151.103.xxx.xxx
to $ext_if port 22 keep state</b>

I used x's only to hide the other part of the ip address.  I need to
let in a range of ip's like, 192.168.0.1-192.168.32.254.