Valid $hour parameter to Cron::Job.
Alias of
Variant[Integer[0,23], Pattern[/(?x)\A( \* ( \/ ( 1[0-9]|2[0-3]|[1-9] ) )? | ( 1?[0-9]|2[0-3] ) ( - ( 1?[0-9]|2[0-3] ) ( \/ ( 1[0-9]|2[0-3]|[1-9] ) )? )? ( , ( 1?[0-9]|2[0-3] ) ( - ( 1?[0-9]|2[0-3] ) ( \/ ( 1[0-9]|2[0-3]|[1-9] ) )? )? )* )\z/]]
# File 'types/hour.pp', line 2