[R] Extracting matched expressions

[Gabor Grothendieck]

strapply in the gsubfn package can do that. It applies the indicated
function, here just c, to the back references from the pattern match
and then simplifies the result using simplify. (If you omit simplify
here it would give a one element list like strsplit does.)

library(gsubfn)
pat <- "(.*?) (.*?) ([ehtr]{5})"
strapply("one two three", pat, c, simplify = c)

See home page at: http://gsubfn.googlecode.com


On Sun, Nov 8, 2009 at 1:51 PM, Hadley Wickham <hadley at rice.edu> wrote:
> Hi all,
>
> Is there a tool in base R to extract matched expressions from a
> regular expression?  i.e. given the regular expression "(.*?) (.*?)
> ([ehtr]{5})" is there a way to extract the character vector c("one",
> "two", "three") from the string "one two three" ?
>
> Thanks,
>
> Hadley
>
> --
> http://had.co.nz/
>
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