It would have been helpful for that person to specify their candidate
regex, rather than just saying it could be simpler.
That out of the way, I believe
exportPattern("^[^.]")
would be sufficient since the square brackets remove any special
meaning the dot has. For an alternative, given the limitations on
syntactic identifiers in R (namely, that they must start with either a
dot or letters), one might also consider
exportPattern("^[A-Za-z]")
On Sat, 16 Mar 2024 at 11:03, Rolf Turner <rolftur...@posteo.net> wrote:
>
>
> There was fairly recently a discussion on this list of a problem whose
> solution involved having code in NAMESPACE which exported everything
> whose name did not start with ".".
>
> In the course of this discussion it was remarked that the code given in
> "Writing R Extensions", explicitly
>
> exportPattern("^[^\\.]")
>
> wasn't quite right and could/should have a simpler form.
>
> I don't really understand what's going on --- regular expressions
> completely blow me away.
>
> Can someone please inform me as to what the simpler form should be?
>
> [What really frustrates me is that I was *sure* I had saved the emails
> pertaining to this discussion, but now I cannot find any <expletive
> deleted> trace of what I thought I'd saved!]
>
> cheers,
>
> Rolf Turner
>
> --
> Honorary Research Fellow
> Department of Statistics
> University of Auckland
> Stats. Dep't. (secretaries) phone:
> +64-9-373-7599 ext. 89622
> Home phone: +64-9-480-4619
>
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