| From: | Shaozhong SHI <shishaozhong(at)gmail(dot)com> |
|---|---|
| To: | Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net> |
| Cc: | pgsql-general <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: How to allow null as an option when using regexp_matches? |
| Date: | 2021-12-08 17:07:27 |
| Message-ID: | CA+i5Jwb0A=_Uh+CbAm9qeXC5otc1fWWEUsPqA8Ci4cng3qTgdw@mail.gmail.com |
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| Lists: | pgsql-general |
Hi, Karsten,
That sounds interesting.
Any good example?
Regards, David
On Wed, 8 Dec 2021 at 12:10, Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net>
wrote:
> Am Wed, Dec 08, 2021 at 12:07:13PM +0000 schrieb Shaozhong SHI:
>
> > We can do this:
> > select count(*) from regexp_matches('Great London', 'Great
> > London|Information Centre|Department for Transport', 'g');
> >
> > Is it possible to allow null as an option? something like this
> > select count(*) from regexp_matches('Great London', 'null|Great
> > London|Information Centre|Department for Transport', 'g');
>
> You seem to want to apply coalesce() judiciously.
>
> Best,
> Karsten
> --
> GPG 40BE 5B0E C98E 1713 AFA6 5BC0 3BEA AC80 7D4F C89B
>
>
>
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