# phpman > man > ExtUtils::ParseXS::Constants

## NAME
    [ExtUtils::ParseXS::Constants](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AParseXS%3A%3AConstants/markdown) - Initialization values for some globals

## SYNOPSIS
      use [ExtUtils::ParseXS::Constants](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AParseXS%3A%3AConstants/markdown) ();

      $PrototypeRegexp = $[ExtUtils::ParseXS::Constants::PrototypeRegexp](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AParseXS%3A%3AConstants%3A%3APrototypeRegexp/markdown);

## DESCRIPTION
    Initialization of certain non-subroutine variables in [ExtUtils::ParseXS](https://www.chedong.com/phpMan.php/perldoc/ExtUtils%3A%3AParseXS/markdown) and some of its
    supporting packages has been moved into this package so that those values can be defined exactly
    once and then re-used in any package.

    Nothing is exported. Use fully qualified variable names.