On Sun, Aug 22, 2010 at 6:05 PM, Waverley @ Palo Alto
<waverley.paloa...@gmail.com> wrote:
> Hi,
>
> In perl, to get a substring matching a particular pattern can be
> implemented like the following example:
>
> $x = "AAAA.txt";
> if ($x=~ /(.*?)\.txt/){
> $prefix = $1;
> }
>
> So how to do the same thing in R?
>
> Can someone provide me the code sample?
>
Try any of these:
x <- "AAAA.txt"
# 1
sub("(.*)\\.txt", "\\1", x)
# 2
sub(".txt$", "", x)
# 3
strsplit(x, "\\.")[[1]][1]
#4
library(gsubfn)
strapply(x, "(.*)\\.txt", simplify = c)
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