Can't I set variables in conditional operator inside an evaluate expression?

Hey there!

Why doesn't the following evaluate expression work?

"find(usage, "/") > 0" returns 1 in console log. And 1 should be "true" right?

This does not trigger. There is no browser log shown:

Can't I set variables inside this conditional operator?

What am I doing wrong here?

Edit: I added the parentheses just for testing purposes. Originally I had

find(usage, "/") > 0 ? filter_mode="match" : filter_mode="contains"

Ahhhh! Now I got it.

I tried it with action set variable but I did it wrong:

find(usage, "/") > 0 ? filter_mode="match" : filter_mode="contains"

Thank you!