Hi Mark Na,
Try:
grepl("latitude\\^2",temp)
^ is a control character for negation, so you have to escape it.
Cheers,
Tsjerk
On Mon, Jan 21, 2013 at 4:26 PM, <mtb...@gmail.com> wrote:
> Hello R-helpers,
>
> I am trying to search for string that includes the caret symbol, using the
> following code:
>
> grepl("latitude^2",temp)
>
>
> And R doesn't like that. It gives me:
>
> > temp<-c("latitude^2","latitude and latitude^2","longitude^2","longitude
> and longitude^2")
> > temp
> [1] "latitude^2" "latitude and latitude^2" "longitude^2"
> "longitude and longitude^2"
> > grepl("latitude^2",temp)
> [1] FALSE FALSE FALSE FALSE
>
>
> I think this must a regex problem, but I can't find out to specify the
> caret using regex.
>
> I would appreciate any help you could provide.
>
> Many thanks,
>
> Mark Na
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
--
Tsjerk A. Wassenaar, Ph.D.
post-doctoral researcher
Biocomputing Group
Department of Biological Sciences
2500 University Drive NW
Calgary, AB T2N 1N4
Canada
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