[Rd] Outdated information in regex.Rd

[Brian Ripley]

On 19 Nov 2015, at 10:05, Martin Maechler <maechler at stat.math.ethz.ch> wrote:

>>>>>> Mikko Korpela <mikko.korpela at aalto.fi>
>>>>>>    on Wed, 18 Nov 2015 11:35:14 +0200 writes:
> 
>> The NEWS for R-devel has the following item:
>>> The previously included versions of zlib, bzip2, xz and PCRE have
>>> been removed, so suitable external (usually system) versions are
>>> required (see the ‘R Installation and Administration’ manual).
> 
>> Therefore I believe the following information in
>> 'src/library/base/man/regex.Rd' is no longer valid:
> 
>>> If PCRE support was compiled from the sources within R, the PCRE
>>> version is 8.36 as described here.
> 
> Not quite.  It is still *valid* : every statement about the
> elements of the empty set are true, in the same sense that
> 
>   if (FALSE)
>     "something or other"
> 
> is never invalid, but of course, that information should still
> be removed because indeed, it is empty.

Help pages are not intended to be just about the current version of R but also recent versions, and most builds of 3.2.x will meet the condition.

However, as from 3.2.0 a user can find the version of PCRE in use by extSoftVersion, and I have added a comment about that, including for 3.2.3.

> 
> Thank you Mikko!
>            (and excuse the completely unnecessary pickyness ;-)
> 
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