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From: Dominique Devienne <ddevienne@gmail.com>
Date: Thu, 6 Mar 2025 11:41:42 +0100
Message-ID: <CAFCRh-8TmYG4Ya_VLsRy2ybZSfYfuOzZ_i0+EGxSkrbja1JZWg@mail.gmail.com>
Subject: Re: psql and regex not like
To: Ron Johnson <ronljohnsonjr@gmail.com>
Cc: pgsql-general <pgsql-general@postgresql.org>
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On Thu, Mar 6, 2025 at 11:24=E2=80=AFAM Ron Johnson <ronljohnsonjr@gmail.co=
m> wrote:
> I already do that.  This is part of a long chain of commands so I'm tryin=
g to minimize the length of commands.

but given that your regexp patterns are not anchored, they are not
equivalent. I think mine is "more correct".

> Anyway, it would be good to know the answer for any future queries that n=
eed multiple exclusions.

Sure. First, it works fine with TCSH :). I repro a (different) failure
in BASH. But the below works fine for me:

psql "service=3Dacme" -Xc 'select datname from pg_database where datname
!~ $$(template|postgres)$$ order by 1'

i.e. use single-quotes, and an inner $$ literal. One of 3 options an
AI chatbot gave me. --DD