PHPMailer::validateAddress( string $address, string|callable $patternselect = null ): bool

1508    public static function validateAddress($address, $patternselect = null)1509    {1510        if (null === $patternselect) {1511            $patternselect = static::$validator;1512        }1513        //Don't allow strings as callables, see SECURITY.md and CVE-2021-36031514        if (is_callable($patternselect) && !is_string($patternselect)) {1515            return call_user_func($patternselect, $address);1516        }1517        //Reject line breaks in addresses; it's valid RFC5322, but not RFC53211518        if (strpos($address, "\n") !== false || strpos($address, "\r") !== false) {1519            return false;1520        }1521        switch ($patternselect) {1522            case 'pcre': //Kept for BC1523            case 'pcre8':1524                /*1525                 * A more complex and more permissive version of the RFC5322 regex on which FILTER_VALIDATE_EMAIL1526                 * is based.1527                 * In addition to the addresses allowed by filter_var, also permits:1528                 *  * dotless domains: `a@b`1529                 *  * comments: `1234 @ local(blah) .machine .example`1530                 *  * quoted elements: `'"test blah"@example.org'`1531                 *  * numeric TLDs: `[email protected]`1532                 *  * unbracketed IPv4 literals: `[email protected]`1533                 *  * IPv6 literals: 'first.last@[IPv6:a1::]'1534                 * Not all of these will necessarily work for sending!1535                 *1536                 * @copyright 2009-2010 Michael Rushton1537                 * Feel free to use and redistribute this code. But please keep this copyright notice.1538                 */1539                return (bool) preg_match(1540                    '/^(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){255,})(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){65,}@)' .1541                    '((?>(?>(?>((?>(?>(?>\x0D\x0A)?[\t ])+|(?>[\t ]*\x0D\x0A)?[\t ]+)?)(\((?>(?2)' .1542                    '(?>[\x01-\x08\x0B\x0C\x0E-\'*-\[\]-\x7F]|\\\[\x00-\x7F]|(?3)))*(?2)\)))+(?2))|(?2))?)' .1543                    '([!#-\'*+\/-9=?^-~-]+|"(?>(?2)(?>[\x01-\x08\x0B\x0C\x0E-!#-\[\]-\x7F]|\\\[\x00-\x7F]))*' .1544                    '(?2)")(?>(?1)\.(?1)(?4))*(?1)@(?!(?1)[a-z0-9-]{64,})(?1)(?>([a-z0-9](?>[a-z0-9-]*[a-z0-9])?)' .1545                    '(?>(?1)\.(?!(?1)[a-z0-9-]{64,})(?1)(?5)){0,126}|\[(?:(?>IPv6:(?>([a-f0-9]{1,4})(?>:(?6)){7}' .1546                    '|(?!(?:.*[a-f0-9][:\]]){8,})((?6)(?>:(?6)){0,6})?::(?7)?))|(?>(?>IPv6:(?>(?6)(?>:(?6)){5}:' .1547                    '|(?!(?:.*[a-f0-9]:){6,})(?8)?::(?>((?6)(?>:(?6)){0,4}):)?))?(25[0-5]|2[0-4][0-9]|1[0-9]{2}' .1548                    '|[1-9]?[0-9])(?>\.(?9)){3}))\])(?1)$/isD',1549                    $address1550                );1551            case 'html5':1552                /*1553                 * This is the pattern used in the HTML5 spec for validation of 'email' type form input elements.1554                 *1555                 * @see https://html.spec.whatwg.org/#e-mail-state-(type=email)1556                 */1557                return (bool) preg_match(1558                    '/^[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}' .1559                    '[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/sD',1560                    $address1561                );1562            case 'eai':1563                /*1564                 * This is the pattern used in the HTML5 spec for validation of 'email' type1565                 * form input elements (as above), modified to accept Unicode email addresses.1566                 * This is also more lenient than Firefox' html5 spec, in order to make the regex faster.1567                 * 'eai' is an acronym for Email Address Internationalization.1568                 * This validator is selected automatically if you attempt to use recipient addresses1569                 * that contain Unicode characters in the local part.1570                 *1571                 * @see https://html.spec.whatwg.org/#e-mail-state-(type=email)1572                 * @see https://en.wikipedia.org/wiki/International_email1573                 */1574                return (bool) preg_match(1575                    '/^[-\p{L}\p{N}\p{M}.!#$%&\'*+\/=?^_`{|}~]+@[\p{L}\p{N}\p{M}](?:[\p{L}\p{N}\p{M}-]{0,61}' .1576                    '[\p{L}\p{N}\p{M}])?(?:\.[\p{L}\p{N}\p{M}]' .1577                    '(?:[-\p{L}\p{N}\p{M}]{0,61}[\p{L}\p{N}\p{M}])?)*$/usD',1578                    $address1579                );1580            case 'php':1581            default:1582                return filter_var($address, FILTER_VALIDATE_EMAIL) !== false;1583        }1584    }