From: Oliver Elphick <olly@lfix.co.uk>
To: Josh Berkus <josh@agliodbs.com>
Cc: Theo Galanakis <Theo.Galanakis@lonelyplanet.com.au>
Cc: pgsql-sql@postgresql.org
Subject: Re: Isnumeric function?
Date: Wed, 08 Sep 2004 19:11:51 +0100
Message-ID: <1094667111.2014.98.camel@linda> (raw)
In-Reply-To: <200409081048.01034.josh@agliodbs.com>
References: <82E30406384FFB44AFD1012BAB230B55037D056E@shiva.au.lpint.net>
<200409080947.17682.josh@agliodbs.com>
<1094664017.2014.80.camel@linda>
<200409081048.01034.josh@agliodbs.com>
On Wed, 2004-09-08 at 18:48, Josh Berkus wrote:
> Theo, Oliver,
>
> > Any reason why you don't like ~ '^([0-9]?)+\.?[0-9]*$' ?
>
> Yes, because it also matches "." , which is not a valid numeric value.
>
> > ~ '^([0-9]+|[0-9]+\\.[0-9]*|[0-9]*\\.[0-9]+)$'
>
> Ah, the brute force approach ;-)
Nothing like using a nice big hammer!
> Actually, the above could be written:
>
> ~ '^([0-9]+)|([0-9]*\\.[0-9]+)$'
But that doesn't allow a trailing decimal point.
>
> ... though that still seems inelegant to me. Is there a regex expert in the
> house?
All the elegant approaches I can think of match the empty string. There
must be at least one digit and 0 or 1 decimal point with no other
characters permitted. If you use this as a constraint, you could make
it elegant and combine it with another constraint to exclude '' and '.'.
--
Oliver Elphick olly@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
GPG: 1024D/A54310EA 92C8 39E7 280E 3631 3F0E 1EC0 5664 7A2F A543 10EA
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To: pgsql-sql@postgresql.org
Cc: olly@lfix.co.uk, josh@agliodbs.com, Theo.Galanakis@lonelyplanet.com.au
Subject: Re: Isnumeric function?
In-Reply-To: <1094667111.2014.98.camel@linda>
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