[R] Grep command

[Steven Yen]

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"


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