On Fri, Sep 12, 2025 at 3:29 PM Dominique Devienne <ddevienne@xxxxxxxxx> wrote:
> On Fri, Sep 12, 2025 at 3:24 PM Dominique Devienne <ddevienne@xxxxxxxxx> wrote:
> > On Fri, Sep 12, 2025 at 3:11 PM Dominique Devienne <ddevienne@xxxxxxxxx> 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)
For completeness:
postgres=# 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)
