How do I negate search terms in campaign filters?

When filtering campaigns by subject in Inbox users can search by partial or full subject lines. Because it can be taxing to keep a running tab of all of your sends we also provide users with the ability to negate terms as well.

For example, say you are search for a campaign that runs daily but you wish to exclude results from June and July, simply add the following into the subject line box:

Daily -June -July