On Jan 15, 2014, at 4:37 PM, Fisher Dennis wrote:
> R 3.0.2
> OS X
>
> Colleagues
>
> I am writing code to read a large number of files in a particular folder. In
> some situations, there may be two versions of the file with different
> extensions, e.g.:
> FILE.csv
> FILE.xls
> I extracted the portion before the extension with:
> sub("\\..*$", "", basename(FILELIST))
> then used
> duplicated
> to find duplicates. All was well until I encountered files named:
> FILE.XXX.csv
> FILE.YYY.xls
>
> My regular expression extracted only the “FILE” portion of the text and
> claimed that the filenames (without the extensions) matched. Can someone
> provide me with the appropriate regular expression to deal with this? Thanks.
Why not:
sub("\\..{3}$", "", basename(FILELIST))
See ?regex
--
David Winsemius
Alameda, CA, USA
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