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From: Robert Elz <kre@munnari.OZ.AU>
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Subject: Re: Bash parameter expansion (remove largest trailing match, remove largest leading match, pattern replacement) does not work
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    Date:        Sat, 29 Aug 2020 10:22:39 -0400
    From:        Bruce Lilly <bruce.lilly@gmail.com>
    Message-ID:  <CAPyES363zNvUZHWo6imXOyC3UPU5FAbsyFGzWkcJMO-HBhT6gQ@mail.gmail.com>


  |        Bash parameter expansion (remove largest trailing match, remove
  | largest leading match, pattern replacement) does not work

This is no more a bug in bash than it is for your similar report against
the NetBSD sh.

That bash is not ksh93 is not a bug.   That bash doesn't implement every
bizarre ksh93 extension is also not a bug.

kre