And yet another way if you only have only a handful of such sites and dont need it to work on arbitrary urls, would be to make one alias called simply "clients" with no regex and in that alias put all of the urls of all of your sites, like:
Now when you type "clients" you would see a list of ALL urls, but as you typed more you would filter/restrict the list, so if you typed "clients examp" you would see the two example links, and if you typed "clients ex log" you would see only the clients examples.com login result:
This works because farr will automatically filter multiple results based on what you type.