RE: [External] : Use the characters "+" and "-" in regular expressions

[Drew Adams]

> Btw, my favorite way to not have to remember all these, ahem, corner
> cases, is to put comments like these near my uglier sexps:
> 
> ;; (info "(elisp)Rx Constructs")
> ;; (rx (any "[]") (one-or-more "=") (any "[]"))

I do the same (e.g., the latter comment).

IOW, I use RX to double-check or sometimes to create a regexp.