How can you be upset that someone finally gave you a reason to learn something...

I'm not upset at having learned something. That's never the case.

As for it being covered in places A, B, and C...Well, I've probably read at least 2 of 'em over the years. I've worn out my magenta-backed Camel. Probably twice if it weren't for duct tape (and the blue-backed one I bought to replace it.) Doesn't mean I remember everything. Do you remember everything you've ever read? What do you get when you multiply six by nine?

What I was requesting was more of an explanation. I've been using Perl for going on 8 or 9 years now. It's not my primary language, but even when I do use it, I rarely if ever need to use the tr/// operator.

As I stated, I followed up on it, and learned something from it. I find that to be a good thing overall. That doesn't mean Abigail couldn't have given a quick one-line reminder of this side effect of the tr operator.

Just MHO.