Oh, I'm jetlagged. ^ is a control character for 'start of string'. In the
context of a character set it means negation: [^a-z].
Ciao,
Tsjerk
On Mon, Jan 21, 2013 at 4:33 PM, Tsjerk Wassenaar <tsje...@gmail.com> wrote:
> 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]]
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> 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
>
--
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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