用于电子邮件验证的Regex查询，以便在php中也包括.ac.uk

Question

我已经在网上搜索和搜索过堆栈溢出，以获得一些指导，但没有什么与我的代码非常吻合。我正在使用PHP对我的用户注册表单进行一些验证，如下面所示，我还想检查用户注册的电子邮件是否以.ac.uk结尾

  // We check for any empty inputs. 
  if (empty($firstName) || empty($lastName) || empty($username) || empty($email) || empty($password) || empty($passwordRepeat)) {
    header("Location: ../signup.php?error=emptyfields&username=".$username."&email=".$email);
    exit();
  }
  // We check for an invalid username AND invalid e-mail.
  else if (!preg_match("/^[a-zA-Z0-9]*$/", $username) && !filter_var($email, FILTER_VALIDATE_EMAIL)) {
    header("Location: ../signup.php?error=invalidunamemail");
    exit();
  }
  // Check for an invalid username. In this case ONLY letters and numbers allowed.
  else if (!preg_match("/^[a-zA-Z0-9]*$/", $username)) {
    header("Location: ../signup.php?error=invalidcharacters");
    exit();
  }

  // Check for minimum amount of characters in username.
  else if (strlen($username) <7 ) {
    header("Location: ../signup.php?error=invalidlengthuname");
    exit();
  }

  // Check for an invalid e-mail. <-- Here is where I also want to add the check of .ac.uk at the end of the email
  else if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    header("Location: ../signup.php?error=invalidemail");
    exit();
  }
  // Check if the repeated password is NOT the same.
  else if ($password !== $passwordRepeat) {
    header("Location: ../signup.php?error=passwordcheck&uname");
    exit();
  }
  else {
// Login

Answer 1

您可以添加preg_match来检查，但如果条件1有效，则可以跳过第二个条件。这很奇怪，但是如果单独添加，它就能工作了。

  // Check for an invalid e-mail. <-- Here is where I also want to add the check of .ac.uk at the end of the email
  if ( !filter_var($email, FILTER_VALIDATE_EMAIL)  &&  preg_match('/ac.uk$/', $email) ) {

      header("Location: ../signup.php?error=invalidemail");
      exit();
  } 

这个会有用的

  // Check for an invalid e-mail. <-- Here is where I also want to add the check of .ac.uk at the end of the email
  if ( !filter_var($email, FILTER_VALIDATE_EMAIL)) {

      header("Location: ../signup.php?error=invalidemail");
      exit();
  } 
  if (!preg_match('/ac.uk$/', $email)) { 

      header("Location: ../signup.php?error=invalidemail");
      exit();

  }

Answer 2

正则表达式到电子邮件Regex匹配特定域

^[a-zA-Z0-9_.+-]+@(?:(?:[a-zA-Z0-9-]+\.)?[a-zA-Z]+\.)?(yourdomain)\.ac.uk$

演示

这里是更多的例子

UPDATE：在您的评论中，首先检查扩展，如果它是可接受的域，然后验证。

$email = 'test@domain.ac.uk';
$extention = pathinfo($email, PATHINFO_EXTENSION);
if($extension == ".ac.uk"){
   //Do your validation here 
   filter_var($email, FILTER_VALIDATE_EMAIL));
}else{
   //Invalid extention Reject email
}