Message-ID: <48D2185A.4060901@erasmusmc.nl>
Date: 2008-09-18T08:59:06Z
From: Dimitris Rizopoulos
Subject: character position
In-Reply-To: <!&!AAAAAAAAAAAYAAAAAAAAAAiqk/5CNPFFq17hx4jN18vCgAAAEAAAAINouxDHw1BCtOBv1wpYVw4BAAAAAA==@netcabo.pt>
you could use gsub(), e.g.,
strg <- "There are 20 species in this grid"
gsub("[^0-9]", "", strg)
I hope it helps.
Best,
Dimitris
Paulo Cardoso wrote:
> Hi,
>
> I'm not being able to capture a position of a 'string' in a character
> string.
>
> In this example: 'There are 20 species in this grid'
>
> I would like to capture the string (number) after 'are' and before
> 'species'. Consider they do not change. I wouldn't like to use substr
> because stop position may change.
>
> Thanks
>
> Paulo
>
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>
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014