MIME-Version: 1.0
References: <CAFCRh-8NwJd0jq6P=R3qhHyqU7hw0BTor3W0SvUcii24et+zAw@mail.gmail.com>
 <CAFCRh-93hsRvoJqQCwXq06=AJJJ_s783gVsGHKc-QjgOO6jGVg@mail.gmail.com>
 <77a63548783dd4007ee479a4c5ed300629aaa776.camel@cybertec.at>
 <CAFCRh--DPWEHpRmdr-Jfw4guYqjc9TM_QyVH7SR4B=Le5gGe3Q@mail.gmail.com> <CAFCRh--M1y2YpJJMb6undzvyvhd4geKtRWFkDyr1shHvvoOkpQ@mail.gmail.com>
In-Reply-To: <CAFCRh--M1y2YpJJMb6undzvyvhd4geKtRWFkDyr1shHvvoOkpQ@mail.gmail.com>
From: Dominique Devienne <ddevienne@gmail.com>
Date: Fri, 12 Sep 2025 15:29:33 +0200
Message-ID: <CAFCRh-_OBKtabe8MO0vUocNSq_O3_b852AXknPiNhL0tNUBGQg@mail.gmail.com>
Subject: Re: Latest patches break one of our unit-test, related to RLS
To: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: pgsql-general@postgresql.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Archived-At: <https://www.postgresql.org/message-id/CAFCRh-_OBKtabe8MO0vUocNSq_O3_b852AXknPiNhL0tNUBGQg%40mail.gmail.com>
Precedence: bulk

On Fri, Sep 12, 2025 at 3:24=E2=80=AFPM Dominique Devienne <ddevienne@gmail=
.com> wrote:
> On Fri, Sep 12, 2025 at 3:11=E2=80=AFPM Dominique Devienne <ddevienne@gma=
il.com> wrote:

> So I don't see how my `... where v similar to 'foo[\d\w]_%'` is incorrect=
.
> So again, is this a bug / regression or not? Thanks, --DD

If I use (x|y) instead of [xy] it seems to behave correctly.
Whether x is the full-length POSIX class, or the shorthand notation.
This DOES look like a bug, no? I've done regexes for a long time,
and these two forms should be equivalent IMHO. --DD

postgres=3D# show server_version;
 server_version
----------------
 18rc1
(1 row)


postgres=3D# with t(v) as (values ('foo:bar'), ('foo/bar'), ('foo0bar'))
select v from t where v similar to 'foo[\d\w]_%';
 v
---
(0 rows)


postgres=3D# with t(v) as (values ('foo:bar'), ('foo/bar'), ('foo0bar'))
select v from t where v similar to 'foo[[[:digit:]][[:word:]]]_%';
 v
---
(0 rows)


postgres=3D# with t(v) as (values ('foo:bar'), ('foo/bar'), ('foo0bar'))
select v from t where v similar to 'foo([[:digit:]]|[[:word:]])_%';
    v
---------
 foo0bar
(1 row)


postgres=3D# with t(v) as (values ('foo:bar'), ('foo/bar'), ('foo0bar'))
select v from t where v similar to 'foo(\d|\w)_%';
    v
---------
 foo0bar
(1 row)