Hi Duncan, why not split on / and take the correct elements? It is not as elegant as regex but could do the trick.
Best, Ulrik On Mon, 9 Oct 2017 at 17:03 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/posting-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.