Frank Goossens on "[Plugin: Autoptimize] exclude css or js by path"

There are examples in the FAQ, under "How does "exclude from optimizing" work?". But more generally speaking, you can exclude based on any string really;

e.g. for
`//storage.googleapis.com/nelioabtesting/6209123576184832.js?ver=4.1.1'

you could use storage.googleapis.com or googleapis.com or nelioabteting or 6209123576184832.js or storage.googleapis.com/nelioabtesting or nelioabtesting/6209123576184832.js or googleapis.com/nelioabtesting/6209123576184832.js or storage.googleapis.com/nelioabtesting/6209123576184832.js ... it all depends on how specific you want to be.

In your case I'd indeed just use 'nelioabtesting' or 'googleapis.com/nelioabtesting'.

hope this clarifies,
frank