[ISay]

I know, thanks to y'all, that [A-Z]{2,} will find words written in ALL
CAPS. How can I find and highlight all instances?

Is there a way to get it to recognize whole words and not instances like FBI
or CIA?

When I have searched for words and then marked them to be highlighted, when
I exit the FIND window, the highlighting disappears. I know I'm not doing
something right but I don't know what.