How to use the ~ (includes) filter operator?

Thanks for your reply @Mike Moniz.

Yes, this has been my finding too, that only the first alert is returned.  I gave up after a while and resorted to looping through and making separately calls for each alert (can't pull all alerts as am only interested in alerts for a particular widget).  Annoyingly using get widget data call doesn't support the alert message detail option either, or there would be no need for the second calls to get alert details.

@Sarah Terry - for info.