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
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