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Re: regex (not) matching null string

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "David M(dot) Kaplan" <dmkaplan(at)ucdavis(dot)edu>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: regex (not) matching null string
Date: 2002-06-21 19:01:34
Message-ID: 21970.1024686094@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-bugs
"David M. Kaplan" <dmkaplan(at)ucdavis(dot)edu> writes:
> I have found that !~ and !~* do not match the null string even when one 
> would expect them to.

NULL strings won't match anything.  I can't tell whether your row 3 is
an empty string or a NULL --- but if it's a NULL, this behavior is
not a bug.  Try "s IS NULL" if you want to find NULLs.

			regards, tom lane

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