[R] R regular expression to extract words with the query string.

[Gabor Grothendieck]

Try this:

library(gsubfn)
i <- "transcript:ENST0000112334 pid:ENSP000012345"
strapply(i, paste("\\w*", "ENSP", "\\w*", sep = ""), c, simplify = unlist)

This says to match any number (possibly zero) of word
characters followed by ENSP followed by more word
characters.  c just returns the match without
further processing and unlist unlists the result giving
a character vector (which otherwise would be a list).

See http://gsubfn.googlecode.com for more info.

On Wed, Jul 8, 2009 at 9:04 AM, Praveen
Surendran<praveen.surendran at ucd.ie> wrote:
> Hi,
>
>
>
> Is there a way in R to get the string which matches the expression, where
> the expression is a substring of the parent string.
>
>
>
> Lets say, I have $i <- "transcript:ENST0000112334 pid:ENSP000012345"
>
> What I need is the string "pid:ENSP000012345" from $i using the query
> "ENSP".
>
>
>
> Appreciate your comments.
>
>
>
> Praveen  Surendran
>
> School of Medicine and Medical Sciences
>
> University College Dublin
>
> Belfiled, Dublin 4
>
> Ireland.
>
>
>
>
>        [[alternative HTML version deleted]]
>
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