[R] Regular expression help

[Ulrik Stervbo]

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.duncan at 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 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.

	[[alternative HTML version deleted]]