> x <- "f 147/1315/587 2820/1320/587 3624/1321/587 1852/1322/587"
> gsub("(^| *)([^/ ]*/?){0,2}", "\\1", x)
[1] " 587 587 587 587"
> y <- "aa aa/ aa/bb aa/bb/ aa/bb/cc aa/bb/cc/ aa/bb/cc/dd aa/bb/cc/dd/"
> gsub("(^| *)([^/ ]*/?){0,2}", "\\1", y)
[1] " cc cc/ cc/dd cc/dd/"
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Mon, Oct 9, 2017 at 8:02 AM, Duncan Murdoch <murdoch.dun...@gmail.com>
wrote:
> I have a file containing "words" like
>
>
> a
>
> a/b
>
> a/b/c
>
> where there may be multiple words on a line (separated by spaces). The a,
> b, and c strings can contain non-space, non-slash characters. I'd like to
> use gsub() to extract the c strings (which should be empty if there are
> none).
>
> A real example is
>
> "f 147/1315/587 2820/1320/587 3624/1321/587 1852/1322/587"
>
> which I'd like to transform to
>
> " 587 587 587 587"
>
> Another real example is
>
> "f 1067 28680 24462"
>
> which should transform to " ".
>
> I've tried a few different regexprs, but am unable to find a way to say
> "transform words by deleting everything up to and including the 2nd slash"
> when there might be zero, one or two slashes. Any suggestions?
>
> Duncan Murdoch
>
> ______________________________________________
> R-help@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/posti
> ng-guide.html
> and provide commented, minimal, self-contained, reproducible code.
[[alternative HTML version deleted]]
______________________________________________
R-help@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.
