[R] grep searching for sequence of 3 consecutive upper case letters

[rfrancois at mango-solutions.com]

Quoting David Barron <mothsailor at googlemail.com>:

> Try
>
> str[grep('[[:upper:]]{3}',str)]
>

or more efficiently :

grep('[[:upper:]]{3}', str, value = TRUE)


> On 06/11/06, Lapointe, Pierre <Pierre.Lapointe at nbf.ca> wrote:
>> Hello,
>>
>> I need to identify all elements which have a sequence of 3 consecutive upper
>> case letters, anywhere in the string.
>>
>> I tested my grep expression on this site: http://regexlib.com/RETester.aspx
>>
>> But when I try it in R, it does not filter anything.
>>
>> str <-c("AGH", "this WOUld be good", "Not Good at All")
>> str[grep('[A-Z]{3}',str)] #looking for a sequence of 3 consecutive upper
>> case letters
>>
>> [1] "AGH"                "this WOUld be good" "Not Good at All"
>>
>> Any idea?
>>
>> Pierre
>>
>> **************************************************
>> AVIS DE NON-RESPONSABILITE: Ce document transmis par courrie...{{dropped}}
>>
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
> --
> =================================
> David Barron
> Said Business School
> University of Oxford
> Park End Street
> Oxford OX1 1HP
>
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>