> On Jun 21, 2016, at 3:09 PM, William Dunlap via R-help <r-help@r-project.org>
> wrote:
>
> You could remove all non-digits from the strings with
>> gsub("[^[:digit:]]+", "", x)
> [1] "0122" "" "" "89963" "1" "8"
> and then count the number of characters remaining with nchar
>> x[nchar(gsub("[^[:digit:]]+", "", x)) <= 1]
> [1] "RTGFFFF" "GF TYHH" "KFTR1" "RT 8"
>
> Or you could do it with grep and a fancier regular expression
>> grep(value=TRUE, "^[^[:digit:]]*([[:digit:]][^[:digit:]]*){0,1}$", x)
> [1] "RTGFFFF" "GF TYHH" "KFTR1" "RT 8"
>
If the question is how to slect those items with no adjacent digits, which is
not exactly what was described but was one possible interpretation of the
example, it could be:
> x[ !grepl("\\d{2,}", x) ]
[1] "RTGFFFF" "GF TYHH" "KFTR1" "RT 8"
and an addition regex OR "clause" could handle the possibility of separated
digits:
> x[ !grepl("\\d{2,}|\\d.+\\d", x) ]
[1] "RTGFFFF" "GF TYHH" "KFTR1" "RT 8"
--
David.
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Tue, Jun 21, 2016 at 2:55 PM, Marine Regis <marine.re...@hotmail.fr>
> wrote:
>
>>
>> Hello,
>>
>>
>>
>> I have a vector x of character strings:
>>
>>
>>
>> x <- c("LM0122","RTGFFFF", "GF TYHH", "HJN 89963", "KFTR1","RT 8")
>>
>>
>>
>>> From this vector, how can I extract the following character strings
>> (i.e., which contain 0 or 1 numeric value)
>>
>>
>>
>> [1] "RTGFFFF" "GF TYHH" "KFTR1" "RT 8"
>>
>>
>>
>> Thank you very much for your help.
>>
>> Have a nice day
>>
>> Marine
>>
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
David Winsemius
Alameda, CA, USA
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
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