private static function init_legacy_tag_bits()
 {
     if (self::$legacy_flags === NULL) {
         self::$legacy_flags = self::tag_bit(CrayonSettings::CAPTURE_MINI_TAG) | self::tag_bit(CrayonSettings::INLINE_TAG) | self::tag_bit(CrayonSettings::PLAIN_TAG);
     }
     if (self::$tags_regex_legacy === "") {
         self::init_tags_regex(TRUE, self::$legacy_flags, self::$tags_regex_legacy);
     }
 }