protected function fulltextSearchInMeta( $search ) {

		$meta = new \Pressbooks\Metadata();
		$data = $meta->getMetaPostMetadata();

		foreach ( $data as $key => $haystack ) {
			// Skip anything not prefixed with pb_
			if ( ! preg_match( '/^pb_/', $key ) ) {
				continue;
			}
			if ( is_array( $haystack ) ) {
				$haystack = implode( ' ', $haystack );
			}
			if ( stripos( $haystack, $search ) !== false ) {
				return true;
			}
		}
		return false;
	}