public static function is_postcode( $postcode, $country ) {
		if ( strlen( trim( preg_replace( '/[\s\-A-Za-z0-9]/', '', $postcode ) ) ) > 0 ) {
			return false;
		}

		switch ( $country ) {
			case 'AT':
				$valid = (bool) preg_match( '/^([0-9]{4})$/', $postcode );
				break;
			case 'BR':
				$valid = (bool) preg_match( '/^([0-9]{5})([-])?([0-9]{3})$/', $postcode );
				break;
			case 'CH':
				$valid = (bool) preg_match( '/^([0-9]{4})$/i', $postcode );
				break;
			case 'DE':
				$valid = (bool) preg_match( '/^([0]{1}[1-9]{1}|[1-9]{1}[0-9]{1})[0-9]{3}$/', $postcode );
				break;
			case 'ES':
			case 'FR':
			case 'IT':
				$valid = (bool) preg_match( '/^([0-9]{5})$/i', $postcode );
				break;
			case 'GB':
				$valid = self::is_gb_postcode( $postcode );
				break;
			case 'IE':
				$valid = (bool) preg_match( '/([AC-FHKNPRTV-Y]\d{2}|D6W)[0-9AC-FHKNPRTV-Y]{4}/', wc_normalize_postcode( $postcode ) );
				break;
			case 'JP':
				$valid = (bool) preg_match( '/^([0-9]{3})([-])([0-9]{4})$/', $postcode );
				break;
			case 'PT':
				$valid = (bool) preg_match( '/^([0-9]{4})([-])([0-9]{3})$/', $postcode );
				break;
			case 'US':
				$valid = (bool) preg_match( '/^([0-9]{5})(-[0-9]{4})?$/i', $postcode );
				break;
			case 'CA':
				// CA Postal codes cannot contain D,F,I,O,Q,U and cannot start with W or Z. https://en.wikipedia.org/wiki/Postal_codes_in_Canada#Number_of_possible_postal_codes.
				$valid = (bool) preg_match( '/^([ABCEGHJKLMNPRSTVXY]\d[ABCEGHJKLMNPRSTVWXYZ])([\ ])?(\d[ABCEGHJKLMNPRSTVWXYZ]\d)$/i', $postcode );
				break;
			case 'PL':
				$valid = (bool) preg_match( '/^([0-9]{2})([-])([0-9]{3})$/', $postcode );
				break;
			case 'CZ':
			case 'SK':
				$valid = (bool) preg_match( '/^([0-9]{3})(\s?)([0-9]{2})$/', $postcode );
				break;
			case 'NL':
				$valid = (bool) preg_match( '/^([1-9][0-9]{3})(\s?)(?!SA|SD|SS)[A-Z]{2}$/i', $postcode );
				break;
			case 'SI':
				$valid = (bool) preg_match( '/^([1-9][0-9]{3})$/', $postcode );
				break;
			default:
				$valid = true;
				break;
		}

		return apply_filters( 'woocommerce_validate_postcode', $valid, $postcode, $country );
	}