Hi all
I have a question regarding differences in the way gregpexr works in R 2.3.0
and R 2.4.0.
In R 2.3.0, this is what happens:
> gregexpr(" [a-z] [a-z] ", " a b c d e f ", perl=T)
[[1]]
[1] 1 3 5 7 9
attr(,"match.length")
[1] 5 5 5 5 5
... while in R 2.4.0, this is what happens:
> gregexpr(" [a-z] [a-z] ", " a b c d e f ", perl=T)
[[1]]
[1] 1 7
attr(,"match.length")
[1] 5 5
Looking at the archives, I came across these sites where the reverse issue has
been discussed before:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/75843.html
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/76815.html
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/75846.html
>From there, it seems as if the first result has been considered undesirable
>(apparently because it differs from Perl's output if not also for other
>reasons) and R. Gentleman wrote that "[t]his has been reverted in R-devel, so
>you should get the old behavior in it." However,
(i) I could not find any announcement of that change in the change log (the
news file at <https://svn.r-project.org/R/trunk/NEWS> or at
<http://cran.r-project.org/src/base/NEWS>) so I am still not sure whether this
change of behavior is in fact due to changes by the R Development Core Team or
not. So, first question: is this change intended or not? (My system has not
changed otherwise.)
(ii) Since for some applications of mine the first behavior above was exactly
what I needed, I now have the same (second) question as Thomas Girke before: is
there a way to get the first of the two results now in R 2.4.0 (on a Windows XP
machine)?
Thanks a lot,
STG
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