[R] strsplit, keeping delimiters

[Martin Morgan]

"hadley wickham" <h.wickham at gmail.com> writes:
n
> On Sat, Jun 14, 2008 at 12:55 AM, Gabor Grothendieck
> <ggrothendieck at gmail.com> wrote:
>> Try this:
>>
>>> library(gsubfn)
>>> x <- "A: 123 B: 456 C: 678"
>>> strapply(x, "[^ :]+[ :]|[^ :]+$")
>> [[1]]
>> [1] "A:"   "123 " "B:"   "456 " "C:"   "678"

Also

> strsplit(x, "(?<=[0-9:] )", perl=TRUE)
[[1]]
[1] "A: "  "123 " "B: "  "456 " "C: "  "678" 

which uses perl's zero-length lookbehind to match "" preceed by a
digit or : and then a space. This is not quite what you asked for

> I'd like to get

> c("A:", "123 ", "B: ", "456 ", "C: ", 678)

(no space after A:) or what Gabor offered (no spaces after :) but maybe
what you intended?

Martin

>>
>> and check out the gsubfn home page at:
>>
>> http://gsubfn.googlecode.com
>
> Thanks Gabor!
> Hadley
>
> -- 
> http://had.co.nz/
>
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-- 
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
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