[R] help to slip a file name using "strsplit" function

[Gabor Grothendieck]

On Wed, Jan 25, 2012 at 10:26 AM, gianni lavaredo
<gianni.lavaredo at gmail.com> wrote:
> Dear Researchers,
>
> I have several files as this example: Myfile_MyArea1_sample1.txt
>
> i wish to split in "Myfile", "MyArea1", "sample1", and "txt", becasue i
> need to use "sample1" label. I try to use "strsplit" but I am able just to
> split as "Myfile_MyArea1_sample1" and "txt" OR "Myfile", "MyArea1",
> "sample1.txt" using
>
>
> strsplit(as.character("Myfile_MyArea1_sample1.txt"), ".", fixed = TRUE)
> strsplit(as.character("Myfile_MyArea1_sample1.txt"), "_", fixed = TRUE)
>

Replace the . with _ and then strsplit on _ like this:

> strsplit(chartr(".", "_", "Myfile_MyArea1_sample1.txt"), "_")[[1]]
[1] "Myfile"  "MyArea1" "sample1" "txt"

If the idea is just to extract "sample1" then try replacing everything
up to the last _ and everything from the dot onwards with empty
strings like this:

> gsub(".*_|[.].*", "", "Myfile_MyArea1_sample1.txt")
[1] "sample1"


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