Highlight/sort Meeting Receipts which contain text

I would like to create a rule that will allow me to filter all of the meeting receipts where people have typed in a message to me.

This is to prevent me from reviewing the meeting receipts that don’t have any verbiage contained in the body.

I see where I can look for specific words, but don’t know how to examine for the presence of text.

How can I filter out these empty responses?