How to verify email with PHP regular expression-PHP Tutorial-php.cn

How to verify email with PHP regular expression

墨辰丷

Release： 2023-03-31 12:10:02

Original

1941 people have browsed it

本篇文章主要介绍PHP正则表达式验证Email的方法，感兴趣的朋友参考下，希望对大家有所帮助。

本文实例讲述了PHP正则验证Email的方法。具体如下：

 64)
  {
   // local part length exceeded
   $isValid = false;
  }
  else if ($domainLen < 1 || $domainLen > 255)
  {
   // domain part length exceeded
   $isValid = false;
  }
  else if ($local[0] == '.' || $local[$localLen-1] == '.')
  {
   // local part starts or ends with '.'
   $isValid = false;
  }
  else if (preg_match('/\\.\\./', $local))
  {
   // local part has two consecutive dots
   $isValid = false;
  }
  else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain))
  {
   // character not valid in domain part
   $isValid = false;
  }
  else if (preg_match('/\\.\\./', $domain))
  {
   // domain part has two consecutive dots
   $isValid = false;
  }
  else if(!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/', str_replace("\\\\","",$local)))
  {
   // character not valid in local part unless 
   // local part is quoted
   if (!preg_match('/^"(\\\\"|[^"])+"$/', str_replace("\\\\","",$local)))
   {
   $isValid = false;
   }
  }
  if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A")))
  {
   // domain not found in DNS
   $isValid = false;
  }
 }
 return $isValid;
}
?>

Copy after login

总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。

相关推荐：

php实现农历算法与原理

基于PHP获取某个月份周次信息

php可逆加密的方法及原理

The above is the detailed content of How to verify email with PHP regular expression. For more information, please follow other related articles on the PHP Chinese website!