/** * Return regex to match xml (p)rocessing (i)nstructions * * Quoted substring and heredoc type of substrings are allowed in PI. Key * is the $option setting. * * @param string $target literal target, like 'php' * @param int $option regex option * @return string * @access public * @static */ public static function xmlProcessing($target = 'php', $option = RegExOption::OPTION_ALLOPTS) { return RegEx::stringWithOpenClose('<?' . $target, '?>', $option); }