From: Tim Landscheidt <tim@tim-landscheidt.de>
To: pgsql-sql@postgresql.org
Subject: Re: Help with regexp-query
Date: Wed, 03 Aug 2011 04:05:26 +0000
Message-ID: <m37h6vm96h.fsf@passepartout.tim-landscheidt.de> (raw)
References: <20110728112021.GA31921@sun.ac.za>
Johann Spies <jspies@sun.ac.za> wrote:
> I am struggling a bit to do the following type of update in a table.
> I want the content of a field updated like this:
> Original:
> '||||0894396e-16bf-4e63-aa52-97fe7031eec9||50a6b47c-f69c-414d-bcb6-14bbe403de5f|||'
> After update:
> '|0894396e-16bf-4e63-aa52-97fe7031eec9|50a6b47c-f69c-414d-bcb6-14bbe403de5f|'
> in other words: change all multiple adjacent occurences of '|' to only 1.
> I have tried the following query but it fails:
> select id, regexp_replace(category, (E'\|{2,}'), E'\|') as category from
> akb_articles limit 100
> This ends with 'ERROR: invalid regular expression: quantifier operand
> invalid'.
> I would apreciate some help with this one please.
You need to double the backslashes (e. g. "E'\\|{2,}'");
otherwise the parser will "eat" the first backslash and pass
just "|{2,}" as the second argument to regexp_replace().
Tim
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To: pgsql-sql@postgresql.org
Cc: tim@tim-landscheidt.de
Subject: Re: Help with regexp-query
In-Reply-To: <m37h6vm96h.fsf@passepartout.tim-landscheidt.de>
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