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LIBREGEX-README.md

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Installing an optional external regex package

The default configuration uses the C++ regex library. An external regex library can be used instead, but this option only exists for special needs and you can ignore it (and the rest of this file).

Package implementation selection

The type of regex implementation to be used in the build is defined in the User Macro DEFS in the LGlib-features property:

Implementation Definition Comment
C++ USE_CXXREGEX Default [*]
PCRE2 HAVE_PCRE Faster and more sophisticated [**]
POSIX interface HAVE_REGEX_H Only desirable if significantly faster

Exactly one of these definitions must be used.

[*] The C++ Implementation is configured by default.
[**] The link-grammar package don't use PCRE2-specific features.

Setup

To locate the components of the optional external regex package, the build files use directory locations as defined in the property sheet "Local" (separated by ; from other possible definitions there).

  • Add the library name to Linker->Input->Additional Dependencies.
    Example: pcre2-8.lib. It is not defined by default.
    If the regex library is not added, the rest of the definitions here are practically ignored.

  • The User Macro GNUREGEX_DIR defines the directory of the optional regex package.
    Default: %HOMEDRIVE%%HOMEPATH%\Libraries\gnuregex.

  • Add the directory of regex.h to C/C++->General->Additional Include Directories.
    Default: $(GNUREGEX_DIR)\include.

  • Add the library directory to Linker->General->Additional Library Directories.
    Default: $(GNUREGEX_DIR)\lib.

  • Unless the directory of the regex DLL is in your PATH, put it in the User Macro LG_DLLPATH.
    The default is $(GNUREGEX_DIR)\lib.