Report some of the configuration options of the version of PCRE in use in this R session.
pcre_config()A named logical vector, currently with elements
Support for UTF-8 inputs. Required.
Support for \p{xx} and \P{xx} in regular expressions. Desirable and used by some CRAN packages.
Support for just-in-time compilation. Desirable for speed (but only available as compile-time option on certain architectures as from PCRE 8.20).
Does match recursion use a stack (TRUE, the PCRE
default) or a heap? See the discussion at
http://www.pcre.org/original/doc/html/pcrestack.html. (Added
in R 3.4.0.)
Detection of JIT requires R to have been compiled against the headers of PCRE 8.20 or later: it then checks at runtime the capabilities of the running PCRE library (which could conceivably be earlier).
extSoftVersion for the PCRE version.