> On May 19, 2016, at 4:09 PM, Steven Yen <sye...@gmail.com> wrote:
>
> What is a good way to grep multiple strings (say in a vector)? In the
> following, I grep ants, cats, and fox separately and concatenate them,
> is there a way to grep the trio in one action? Thanks.
>
> all<-c("ants","birds","cats","dogs","elks","fox"); all
> [1] "ants" "birds" "cats" "dogs" "elks" "fox"
> some<-c("ants","cats","fox"); some
> [1] "ants" "cats" "fox"
> j<-c(
> grep(some[1],all,value=F),
> grep(some[2],all,value=F),
> grep(some[3],all,value=F)); j; all[j]
> [1] 1 3 6
> [1] "ants" "cats" "fox"
j <- grep( paste0( some, collapse="|") , all ); j; all[j]
#----------
[1] 1 3 6
[1] "ants" "cats" "fox"
--
David Winsemius
Alameda, CA, USA
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