On Mon, Jan 27, 2014 at 4:15 AM, Roy Smith <r...@panix.com> wrote: > In article <mailman.5996.1390756093.18130.python-l...@python.org>, > Chris Angelico <ros...@gmail.com> wrote: > >> The set [A-z] is equivalent to >> [ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz] > > I'm inclined to suggest the regex compiler should issue a warning for > this. > > I've never seen a character range other than A-Z, a-z, or 0-9. Well, I > suppose A-F or a-f if you're trying to match hex digits (and some > variations on that for octal). But, I can't imagine any example where > somebody wrote A-z and it wasn't an error.
I've used a variety of character ranges, certainly more than the 4-5 you listed, but I agree that A-z is extremely likely to be an error. However, I've sometimes used a regex (bytes mode) to find, say, all the ASCII printable characters - [ -~] - and I wouldn't want that precluded. It's a bit tricky trying to figure out which are likely to be errors and which are not, so I'd be inclined to keep things as they are. No warnings. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
