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From: Dominique Devienne <ddevienne@gmail.com>
Date: Fri, 12 Sep 2025 15:34:58 +0200
Message-ID: <CAFCRh-_U+8fmRoc-sYM5ahp=9dNjs=Dri1LFLcHCgEJX8Zq_oA@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
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On Fri, Sep 12, 2025 at 3:29=E2=80=AFPM Dominique Devienne <ddevienne@gmail=
.com> wrote:
> On Fri, Sep 12, 2025 at 3:24=E2=80=AFPM Dominique Devienne <ddevienne@gma=
il.com> wrote:
> > On Fri, Sep 12, 2025 at 3:11=E2=80=AFPM Dominique Devienne <ddevienne@g=
mail.com> wrote:
>
> > So I don't see how my `... where v similar to 'foo[\d\w]_%'` is incorre=
ct.
> > 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)

For completeness:

postgres=3D# with t(v) as (values ('foo:bar'), ('foo/bar'), ('foo0bar'))
select v from t where v similar to 'foo[0-9a-zA-Z]_%';
    v
---------
 foo0bar
(1 row)