Re: Shy groups and * ...eh, what?

[Bruno Barbier <brubar.cs@gmail.com>]

Michael Heerdegen <michael_heerdegen@web.de> writes:

> Hello again,
>
> thanks for answers so far.  We may want to improve that aspect in the
> docstring of `rx' - but note that the more important question was about
> why "\\`\\(?:ab\\)*\\'" matches "a" - that looks like a bug to me.
>

Looks like a real bug to me too, when using shy groups: it should match
the whole "ab" or nothing, like it does when using implicit or explicit
groups.


And if you request exactly one "a", "a" doesn't match anymore ...

(string-match-p "\\`\\(?:a\\{1\\}b\\)*\\'" "a")
=> nil

I'm getting the same results with emacs 27, emacs 28 and emacs 29.

Shouldn't you use a more alarming title ?

Bruno