On Dec 15, 2010, at 6:01 AM, Nick Sabbe wrote:
Hi Felipe,
gsub("[^0123456789]", "", "AB15E9SDF654VKBN?dvb.65")
results in "15965465".
Would that be what you are looking for?
I tried figuring out how to do this from a more positive perspective,
meaning finding a regular expression function that did not require
negating the desired elements, but the best I could do was make a
function that accepted a pattern and then hid the underlying negation:
> pullchar <- function(txt, patt){
if(grepl("\\[", patt)){pattn <- sub("\\[", "\\[\\^", patt)}
else{
pattn<- paste("[^",patt,"]", sep="")}
gsub(pattn, "", txt) #return }
> pullchar("AB15E9SDF654VKBN?dvb.65", "ABD")
[1] "ABDB"
> pullchar("AB15E9SDF654VKBN?dvb.65", "[A-Z]")
[1] "ABESDFVKBN"
> pullchar("AB15E9SDF654VKBN?dvb.65", "[0-9]")
[1] "15965465"
Still learning regex so if there is a "positive" strategy I'm all
ears. ...er, eyes?
--
David.
Nick Sabbe
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-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org
] On
Behalf Of Rainer Schuermann
Sent: woensdag 15 december 2010 11:19
To: r-help@r-project.org
Subject: Re: [R] Numbers in a string
If your OS is Linux, you might want to look at sed or gawk. They are
very
good and efficient for such tasks.
You need it once or as a part of program?
Some samples would be helpful...
Rgds,
Rainer
-------- Original-Nachricht --------
Datum: Wed, 15 Dec 2010 16:55:26 +0800
Von: Luis Felipe Parra <felipe.pa...@quantil.com.co>
An: r-help <r-help@r-project.org>
Betreff: [R] Numbers in a string
Hello, I have stings which have all sort of characters (numbers,
letters,
punctuation marks, etc) I would like to stay only with the numbers in
them,
does somebody know how to do this?
Thank you
Felipe Parra
[[alternative HTML version deleted]]
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
