php - preg_match() : Unknown modifier php function

Question

功能不起作用，给我错误

Warning: preg_match(): Unknown modifier '_' in /home/u170751922/public_html/include/functions/main.php on line 325

这是我的代码:

function verify_valid_email($emailtocheck)
{
       $eregicheck = "^([-!#\$%&'*+./0-9=?A-Z^_`a-z{|}~])+@([-!#\$%&'*+/0-9=?A-Z^_`a-z{|}~]+\\.)+[a-zA-Z]{2,4}\$/i";
       return preg_match($eregicheck, $emailtocheck);
}

Answer 1

您忘记了分隔符:

$eregicheck = "/^([-!#\$%&'*+.\/0-9=?A-Z^_`a-z{|}~])+@([-!#\$%&'*+\/0-9=?A-Z^_`a-z{|}~]+\\.)+[a-zA-Z]{2,4}\$/i";

- 另外，请注意，/ 作为分隔符必须在正则表达式本身中转义