用preg_match替换Eregi会返回错误

我对php很陌生，所以请原谅我的知识很差，但我正在使用电子邮件表单让用户在我的网页上注册，但我在运行它时出现了错误。

完整脚本如下:

<?php
if(isset($_POST['email'])) {
    // EDIT THE 2 LINES BELOW AS REQUIRED
    $email_to = "contact@slapmybeat.com";
    $email_subject = "New e-mail subscriber";

    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form your submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }
    // validation expected data exists
    if
        (!isset($_POST['email'])) {
        died('We are sorry, but there appears to be a problem with the email your submitted.');     
    }

    $email_from = $_POST['email']; // required
    $error_message = "";
    $email_exp = "/^[A-Z0-9._%-]+@[A-Z0-9.-]+'.[A-Z]{2,4}$/";
    if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Form details below.'n'n";
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }

    $email_message .= "Email: ".clean_string($email_from)."'n";

// create email headers
$headers = 'From: '.$email_from."'r'n".
'Reply-To: '.$email_from."'r'n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
?>
<!-- include your own success html here -->
Thank you for contacting us. We will be in touch with you very soon.
<?
}
?>

首先，我有一个"eregi折旧"错误，因为最初的脚本如下:

        $error_message = "";
    $email_exp = "^[A-Z0-9._%-]+@[A-Z0-9.-]+'.[A-Z]{2,4}$";
  if(!eregi($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }

用google搜索后，我将其替换为:

    $error_message = "";
    $email_exp = "/^[A-Z0-9._%-]+@[A-Z0-9.-]+'.[A-Z]{2,4}$/";
    if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }

，但现在它给了我以下，虽然电子邮件地址是正确的:

我们很抱歉，你的表格有错误提交。这些错误如下:

您输入的电子邮件地址似乎无效。

请返回并修复这些错误。

任何帮助将不胜感激