.. hook:: H_REGEXP_PACKAGE
  :include: <sys/regexp.h>

  :arg int value: 0 | RE_PCRE | RE_TRADITIONAL

  Optional hook to select the default regexp package to use for regular expression functions.

  If set to 0, the default package determined by the driver's configuration/commandline options is used.

  :history 3.3.595 introduced:

  .. seealso:: :overview:`hook`, :hook:`default_prompt`, :topic:`invocation`, :concept:`regexp`