Is this what you want:

> x <- "This is a foo sentence I am reading."
> # only return the desired match
> sub(".*foo ([^ ]+).*", "\\1 <file://0.0.0.1/>", x)
[1] "sentence"
>
>


On Sun, May 2, 2010 at 6:03 PM, OKB (not okblacke) <brenbarn@brenbarn.net>wrote:

>        I'm trying to figure out how to get the text captured by capturing
> groups out of a regex match.  For instance, let's say I have the pattern
> "foo ([^ ]+)" and I match it against the string "This is a foo sentence
> I am reading."  The group in the pattern will match the word "sentence"
> in the target string.  How can I get access to this matched group?  All
> I can seem to get the various grep/gsub functions to do is return or
> modify the entire target string.  Isn't there a way to extract ONLY the
> text from a particular group or groups?
>
> Thanks,
> --
> --OKB (not okblacke)
> Brendan Barnwell
> "Do not follow where the path may lead.  Go, instead, where there is
> no path, and leave a trail."
>        --author unknown
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?

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