Re: regexp on null

Ya, I kinda knew about these approaches.  The problem ahs to do with novice users who don't know about coalesce or
or;inga check ofr nulls.  I was hoping there was some special regexp expression that would match to a null. 

Thanks for the quick response, and have a great weekend !

-----Original Message-----
From: Richard Broersma [mailto:richard.broersma@gmail.com]
Sent: Friday, September 10, 2010 12:19 PM
To: Gauthier, Dave
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] regexp on null

On Fri, Sep 10, 2010 at 9:00 AM, Gauthier, Dave <dave.gauthier@intel.com> wrote:

> Is there a way to regexp match on a null value?

I would say no.

>  Or is it necessary to OR in a .... "or x is null"?

you could use a

COALESCE( text_column, '') ~ E'MyRegEx';

Or perhaps:
 ( text_column ~ E'MyRegEx' ) IS UNKNOWN
 might work.


--
Regards,
Richard Broersma Jr.

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