Hi Tsjerk, many thanks...that worked perfectly!
Mark Na
On Mon, Jan 21, 2013 at 9:36 AM, Tsjerk Wassenaar <tsje...@gmail.com> wrote:
> 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
>
[[alternative HTML version deleted]]
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