From: Tom Lane <tgl@sss.pgh.pa.us>
To: Chris Travers <chris@travelamericas.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: How to retrieve N lines of a text field.
Date: Thu, 29 Jan 2004 10:50:21 -0500
Message-ID: <22882.1075391421@sss.pgh.pa.us> (raw)
In-Reply-To: <010301c3e679$077698b0$5444053d@winxp>
References: <010301c3e679$077698b0$5444053d@winxp>
"Chris Travers" <chris@travelamericas.com> writes:
> However, this always selects every line but the final one (because %\n seems
> to be interpreted to be the largest possible string, while I want it to be
> the smallest possible string).
I don't think you can solve this in SQL99 regular expressions, but
if you use the POSIX-style regex operators, you can write something
like "[^\n]*\n" to match exactly one line. There are other features
that might help too, such as the counted-match operator "{n}".
Read the man page.
BTW, I bought a copy of the O'Reilly book "Mastering Regular
Expressions" a couple years ago, and it is worth every penny
if you do much of anything with regexes.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, chris@travelamericas.com
Subject: Re: How to retrieve N lines of a text field.
In-Reply-To: <22882.1075391421@sss.pgh.pa.us>
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