php正则验证邮箱的函数

2. function isemail($email) {
3. return strlen($email) > 8 && preg_match("/^[-_+.[:alnum:]]+@((([[:alnum:]]|[[:alnum:]][[:alnum:]-]*[[:alnum:]])\.)+([a-z]{2,4})|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i", $email);
4. }
5. if(!isemail($_POST['email'])) {
6. echo "对不起，验证邮箱地址不正确！";
7. exit();
8. }
9. ?>

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