I wanted to search for the term "Stripe" in all files except those within a plugin ("plugin" folder) or within the files ending in ".bak", ".bak2" or ".log" (this is within the wp-contents folder structure of a wordpress install).
I just wanted to do this search one time and very quickly, so I didn't want to alter the search settings of my environment. Here's how I did it (note the double asteriks for the folder):