Re: :alnum: broken?

[Richard Stallman]

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  > 1. Warning during regexp input (e.g. regexp Isearch)
  >    would likely, itself, be quite confusing or
  >    annoying.

Maybe there is a way to do it that won't be confusing.
If it waits until you type RET to finish the regexp.
then flashes a warning on the screen for two seconds or until there is
more input, it might be clear and not annoying.

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)