Why are you reporting that your PCRE library does not have something
which the R-admin manual says it should preferably have? To wit,
footnote 37 says
'and not PCRE2, which started at version 10.0. PCRE must be built with
UTF-8 support (not the default) and support for Unicode properties is
assumed by some R packages. Neither are tested by configure. JIT support
is desirable.'
That certainly does not fail on my Linux, Windows and OS X builds of
R-devel. (Issues about pre-built binaries, if that is what you used,
should be reported to their maintainers, not here.)
And the help does say in ?regex
In UTF-8 mode, some Unicode properties may be supported via
‘\p{xx}’ and ‘\P{xx}’ which match characters with and without
property ‘xx’ respectively.
Note the 'may'.
On 07/01/2015 23:25, Dan Tenenbaum wrote:
The following code:
res <- gsub("(*UCP)\\b(i)\\b",
"", "nhgrimelanomaclass", perl = TRUE)
results in:
Error in gsub(sprintf("(*UCP)\\b(%s)\\b", "i"), "", "nhgrimelanomaclass", :
invalid regular expression '(*UCP)\b(i)\b'
In addition: Warning message:
In gsub(sprintf("(*UCP)\\b(%s)\\b", "i"), "", "nhgrimelanomaclass", :
PCRE pattern compilation error
'this version of PCRE is not compiled with Unicode property support'
at '(*UCP)\b(i)\b'
on
R Under development (unstable) (2015-01-01 r67290)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.9.5 (Mavericks)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
And also on the same version of R-devel on Snow Leopard, Windows, and Linux.
But it does not produce an error on
R version 3.1.2 (2014-10-31)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Dan
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Brian D. Ripley, rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK
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