WWW redirect to HTTPS

In that case, I would say, use switch command : https://devcentral.f5.com/articles/irules-101-04-switch

switch [HTTP::host] {
"*ircuat.abc.com" {
     do something...
    }
"*jobsuat.abc.com" {
     do something else...
    }
default {
     don't do anything...
    }
}