On Fri, Jan 9, 2009 at 4:20 PM, Wacek Kusnierczyk
<waclaw.marcin.kusnierc...@idi.ntnu.no> wrote:
>
>> Duncan Murdoch wrote:
>>
>>>
>>> I'm curious about something: does "file extension" have a standard
>>> definition? Most (all? I haven't tried them all) of the solutions
>>> presented in this thread would return an empty string for the "plain
>>> base" if given the filename ".bashrc".
>>>
>
>
> right; there's a straightforward fix to my solution that accounts for
> cases such as '.bashrc':
>
> names = c("foo.bar", ".zee")
> sub("(.+)[.][^.]+$", "\\1", names)
>
> you could also use a lookbehind if possible (not in r, afaik).
>
or:
> sub(".*[.]", ".", names)
[1] ".bar" ".zee"
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