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From: Robert Elz <kre@munnari.OZ.AU>
Newsgroups: gnu.bash.bug
Subject: Re: quote removal issues within character class
Date: Sat, 09 Nov 2019 06:52:22 +0700
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Xref: csiph.com gnu.bash.bug:15578

    Date:        Sat, 9 Nov 2019 00:50:52 +0300
    From:        =?UTF-8?B?T8SfdXo=?= <oguzismailuysal@gmail.com>
    Message-ID:  <CAH7i3LrZFvJ1ELJzTdQzF1tTqhi9FDrA7xWWYWrd4RgWJs0Wtg@mail.gmail.com>

These two

  | v=foo
  | echo ${v#[[:"lower":]]}

  | case foo in (*[![:"lower":]]*) echo bar; esac

are because bash believes that the character class name must not
be quoted (which is likely to be clarified to be incorrect in the
next revision of posix).

This one

  | case foo in (*[![":lower":]]*) echo bar; esac

is correct, as "foo" does not contain a ']' which would be required
to match there (quoting the ':' means there is no character class,
hence we have instead (the negation of) a char class containing '[' ':'
'l' 'o' 'w' 'e' ';r' (and ':' again), preceded by anything, and
followed by ']' and anything.   foo does not match. f]oo would.

kre