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From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
Date: Sat, 18 Apr 2020 16:31:19 +0200
Message-ID: <CAN=4vMrqRKVwsOLewSiUs_1RuqOXZQLAtHxdsDZ03hw3SoHeiA@mail.gmail.com>
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To: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Cc: Zsh Users <zsh-users@zsh.org>
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On Sat, Apr 18, 2020 at 4:08 PM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
> pick=3D"(/tmp/gh|./gh)"
> list=3D( ${(M)~pick##/*}(DN) )

I'll simplify:

  pick=3D"(/tmp/gh|./gh)"
  list=3D( $~pick )

This doesn't work because $pick contains slashes within parentheses.
This isn't allowed in file generation (with one exception). From the
docs:

  (...)

  Matches the enclosed pattern. [...]

  Note that grouping cannot extend over multiple directories: it is
  an error to have a =E2=80=98/=E2=80=99 within a group (this only applies =
for
  patterns used in filename generation). There is one exception: a
  group of the form (pat/)# appearing as a complete path segment can
  match a sequence of directories. For example, foo/(a*/)#bar matches
  foo/bar, foo/any/bar, foo/any/anyother/bar, and so on.

Also note that ##/* in your example is applied before file generation.
The effect of the complete example is thus equivalent to this:

  pick=3D"(/tmp/gh|./gh)"
  tmp=3D${(M)pick##/*}
  list=3D( ${~tmp}(DN) )

Roman.