Get all text notes and the text that is in them


hello I am trying to get all the text notes in my project so that I can filter through them via there contents. Is there a way to do this? I dont see a parameter in them so I am not sure how to do it. I found these nodes on the forum that might help (see below) but can anybody tell me what package they came from, or of another node that might help or how to do this? thanks!