Re: :alnum: broken?

[Stefan Monnier]

> 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.

We could also have `read-regexp` show a warning *on the side* while you
type the input, a bit like isearch does when the regexp is
incomplete/invalid.

It would also make sense to make `read-regexp` emit such warnings about
incomplete/invalid regexps.


        Stefan