Grep command

x<-c("abc","def","rst","xyz","age","age2")
x

grep("age2\\b",x)

grep("age\\b",x)

grep("age2$",x)

grep("age$",x)

Thanks but no.
There will be time when I have

zxzxabc and zxzxabc2rst

and I don't like to grep with the string "abc" and end up with both.


On Wed, May 4, 2016 at 2:02 AM, Jim Lemon <drjimlemon at gmail.com> wrote:

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