[R] regular expression question

[jim holtman]

This is probably what you are looking for:

> x <- "TICKER.GGG.XXXXXX.dat"
> sub("^.*?\\.([^.]+).*", "\\1", x, perl=TRUE)
[1] "GGG"
> x <- "TICKER.GGGabce.XXXXXX.dat"
> sub("^.*?\\.([^.]+).*", "\\1", x, perl=TRUE)
[1] "GGGabce"


On Thu, May 1, 2008 at 12:27 PM,  <markleeds at verizon.net> wrote:
> I have strings of the form
>
> TICKER.GGG.XXXXXX.dat
>
> but GGG is not always three characters so I can't use substr to pull it out
> of the string.
>
> Could someone tell me how to use sub to pull out the GGG but more generally
> the string between the dot after the R in TICKER and the next
> dot.  I still don't have a very good understanding of regular expressions
> but I'm trying to get that slowly. thanks.
>
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>



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

What is the problem you are trying to solve?