GREP issue: I want the last word in a paragraph to not hyphante, but it isn't

I followed the instructions here: what grep setting will let me not have a hyphanated word at the end of a paragraph in a paragraph style in indesign

And it's not working. If I take the Character Style and apply it to the whole word, it's blocking the hyphen and moving the whole word to the last line (orphan) of the paragraph. I was assuming that the "\w+$" command would do that. But it's not. As the instructions (above) state, "This forces the entire last word to stay on one line, preventing it from being hyphenated. " What I'm thinking is that this is preventing the last word from hyphenating and is trying to keep it on the original line. There is no room for the entire word on that line, and it has to drop to the next line — which it's not letting happen.

At least that's how it seems. Am I right? If so, how can I get this to move the last word to the next line (and be an orphan)? [I cannot rewrite the text to make room for this orphan; I have to accept that. It's better than having the last line:

er.

Thanks!