character position

Perfect but when one wants to get something different, like

x <- 'INPUT FILE record.dat'
sub(".*FILE (\\w+).*", "\\1", x, perl=TRUE)

will return 'record' and not 'record.dat'

the [:punct:] is not retained.

Paulo

-----Original Message-----
From: jim holtman [mailto:jholtman at gmail.com]
Sent: quinta-feira, 18 de Setembro de 2008 9:58
To: Paulo Cardoso
Cc: r
Subject: Re: [R] character position

If it always occurs after 'are', this will work:

x <-  'There are 20 species in this grid'
y <- sub(".*are (\\d+).*", "\\1", x, perl=TRUE)
y

[1] "20"

On Thu, Sep 18, 2008 at 4:51 AM, Paulo Cardoso <pecardoso at netcabo.pt>
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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Jim Holtman
Cincinnati, OH
+1 513 646 9390

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