Grep command
Hi Steven,
grep uses regex... so you can use this:
-grep("age$",x): it says: match "a", then "g", then "e" and stop. The "$"
menas until here and no more.
grep("age$",x)
[1] 5 2016-05-04 1:02 GMT-05:00 Jim Lemon <drjimlemon at gmail.com>:
Hi Steven,
If this is just a one-off, you could do this:
grepl("age",x) & nchar(x)<4
returning a logical vector containing TRUE for "age" but not "age2"
Jim
On Wed, May 4, 2016 at 3:45 PM, Steven Yen <syen04 at gmail.com> wrote:
Dear all
In the grep command below, is there a way to identify only "age" and
not "age2"? In other words, I like to greb "age" and "age2"
separately, one at a time. Thanks.
x<-c("abc","def","rst","xyz","age","age2")
x
[1] "abc" "def" "rst" "xyz" "age" "age2"
grep("age2",x)
[1] 6
grep("age",x) # I need to grab "age" only, not "age2"
[1] 5 6
______________________________________________ R-help at 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. ______________________________________________ R-help at 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.