[R] Regular expressions on filenames

[arun]

Hi,
Try:
 FILELIST <- list.files()
FILELIST 
#[1] "FILE.csv"     "FILE.XXX.csv" "FILE.YYY.xls"

  sub("(.*)\\..*$", "\\1", basename(FILELIST))
#[1] "FILE"     "FILE.XXX" "FILE.YYY"


A.K.


On Wednesday, January 15, 2014 7:35 PM, Fisher Dennis <fisher at plessthan.com> 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.

Dennis


Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com

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