On Apr 25, 2011, at 6:17 AM, Gonçalo Ferraz wrote:
Hi, I have a string
"InTrouble"
and want to extract, say, the first two characters: "In"
or the last three: "blee"
or the 3rd, 4th, and 5th: "Trou"
Is there an easy way of doing this quickly with regular expressions
in gsub, grep or similar?
Not greppish but seems to be the obvious approach:
> substr("Trouble", 1,2)
[1] "Tr"
> substr("Trouble", 3,5)
[1] "oub"
The greppish ways:
> sub("(^..)(.*$)", "\\1", "Troubles")
[1] "Tr"
> sub("(^..)(...)(.*$)", "\\2", "Troubles")
[1] "oub"
> sub("(^..)(.{3})(.*$)", "\\2", "Troubles")
[1] "oub"
--
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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.
