I've made some edits and added some information. I will try to finish reviewing the rest of the section tomorrow to soften the language throughout from "never do use a bare regex" to "try no to use bare regexes". (Though if someone beats me to it, I won't complain!)

Okay, I think I'm done with the updates. (Thanks to @Shirayuki for marking them for translation and making a few other updates, too.)

If anyone else wants to take a minute to read over my & Shirayuki's changes, or just read the current section, that'd be great, too.

That's definitely clearer, thanks. I did https://www.mediawiki.org/w/index.php?title=Help:CirrusSearch&diff=8055397&oldid=8055177 to hopefully make it more clear and tone down the repetition slightly.

@Pppery, thanks for your bolder edits. I'm always a little hesitant to jump in and make sweeping changes from my WMF account. I appreciate you taking the info I was able to provide and editing it into shape! If you feel like things are done, we can move this ticket to "Done" on the Discovery workboard.

I think things are done.