From: T E Schmitz <mailreg@numerixtechnology.de>
To: Aaron Bono <postgresql@aranya.com>
To: pgsql-sql@postgresql.org
Subject: Re: SELECT substring with regex
Date: Fri, 07 Jul 2006 21:12:52 +0100
Message-ID: <44AEC044.1040206@numerixtechnology.de> (raw)
In-Reply-To: <bf05e51c0607071245w3738e109l8128d345f5b06977@mail.gmail.com>
References: <44AE66E0.1040606@numerixtechnology.de>
<200607071659.14940.gary.stainburn@ringways.co.uk>
<44AE9B4F.1020401@numerixtechnology.de>
<a55915760607071137q2c70346cp5b30cac14beaf1e7@mail.gmail.com>
<bf05e51c0607071245w3738e109l8128d345f5b06977@mail.gmail.com>
Aaron Bono wrote:
> On 7/7/06, *Rodrigo De Leon* <rdeleonp@gmail.com
> <mailto:rdeleonp@gmail.com>> wrote:
>
> On 7/7/06, T E Schmitz <mailreg@numerixtechnology.de
> <mailto:mailreg@numerixtechnology.de>> wrote:
> > But that takes me to the next problem:
> >
> > For the sake of the example I simplified the regular pattern.
> > In reality, BASE_NAME might be:
> >
> > 28mm
> > 28-70mm
> >
> > So the reg. expr. requires brackets:
> >
> > substring (NAME, '^(\\d+(-\\d+)?mm)' ) as BASE_NAME
> >
> > Actually, the pattern is more complex than that and I cannot see
> how I
> > can express it without brackets.
>
> Maybe:
>
> select
> substring ('150mm LD AD Asp XR Macro', '^[\\d-]*mm' ) as BASE_NAME
> , substring('150mm LD AD Asp XR Macro','^[\\d-]*mm (.*)$') as SUFFIX;
>
> select
> substring ('28-70mm LD AD Asp XR Macro', '^[\\d-]*mm' ) as BASE_NAME
> , substring('28-70mm LD AD Asp XR Macro','^[\\d-]*mm (.*)$') as SUFFIX;
>
> etc...
>
> Regards,
>
> Rodrigo
>
>
> Is there a reason this column wasn't separated into two different
> columns? Or perhaps into a child table if there could be more than one
> XXXmm value in the field?
>
> Just curious.
You're absolutely right (see my other posting):
what was entered:
MODEL.NAME "150mm F4 E" TYPE.NAME -
MODEL.NAME "150mm F4 PE" TYPE.NAME -
what should've been entered:
MODEL.NAME "150mm F4"
TYPE.NAME "PE"
TYPE.NAME "E"
both referencing the same MODEL
--
Regards,
Tarlika Elisabeth Schmitz
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Subject: Re: SELECT substring with regex
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