I searched for other posts on this, but I wasn't able to find anything that was exactly what I am looking for.
I would like the search box that is in my sidebar to search through posts AND comments. I would like to do this in the same single search box (i.e. I don't want a separate search box to look in comments.)
In addition (but less importantly), I wouldn't mind if it also searched in "Pages" at the same time.