preg_match在quadodo登录系统中出现'['问题

Question

I'm absolutely confused with this:

$email = (isset($_POST['email']) && preg_match('@^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$@', $_POST['email']) && strlen($_POST['email']) <= 255 && strlen($_POST['email']) > 6) ? $_POST['email'] : false;

Error:

Warning: preg_match(): Unknown modifier '[' in C:\xampp\htdocs\sales\qls-3.1.9\install\Install.class.php on line 283

and I've looked at the actual functions webpage from the official php site

If anyone can help that would be epic!

Answer 1

Problem is that you're using @ as regex delimiter and using @ in the regex without escaping it.

Your regex:

#^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$#