Passwordcheck configuration

I have a requirement to set some password complexity for our database such as length of password, upper case, lower case, special characters, expiration limit, reuse, etc. 

I saw there was a module you can use for this called passwordcheck.  Seems easy to install, but I don't see how you can configure it for you specific needs?  The documentation (https://www.postgresql.org/docs/11/passwordcheck.html) says it can be configured using CrackLib, but again I don't see "how" you go about setting this up.

Does anyone know of any documentation that shows you "how" to set up specific requirements?

Thanks in advance,

Dave Hughes