[R] finding files whose name does NOT contain a given character

Erik Iverson eriki at ccbr.umn.edu
Tue Feb 2 16:22:19 CET 2010

mauede at alice.it wrote:
> Unluckily I dela with miRNA files whose name may contain the character "*".
> Because of the special meaning of "*" I have to remove it.
> I found out how to make list.files() extract only those file names which contain a "*"
> Namely:
> # list.files(pattern="\\*") 
> Now I have to process all files whose name does NOT contain the character "*".
> I cannot have list.files() extract all files  whose name does NOT match pattern="\\*
> I tried using "^" in such a pattern but nothing is returned.
> Any suggestion is welcome.
> Thank you so much,
> Maura

Maybe ?setdiff could even help here ...

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