Re: Latest patches break one of our unit-test, related to RLS - Mailing list pgsql-general

On Fri, Sep 12, 2025 at 3:24 PM Dominique Devienne <ddevienne@gmail.com> wrote:
> On Fri, Sep 12, 2025 at 3:11 PM Dominique Devienne <ddevienne@gmail.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=# show server_version;
 server_version
----------------
 18rc1
(1 row)


postgres=# 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=# 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=# 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=# 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)