PHP regular expression verification Email method, PHP verification Email method _ PHP Tutorial

PHP regular expression verification Email method, PHP verification Email method. PHP regex verification Email method. PHP verification Email method this article describes the PHP regex verification Email method. Share it with you for your reference. The details are as follows: phpfunctionvalidateEmail PHP regular expression verification Email method, PHP verification Email method

This article describes the PHP regular expression verification Email method. Share it with you for your reference. The details are as follows:

<?phpfunction validateEmail($email){  $isValid = true;  $atIndex = strrpos($email, "@");  if (is_bool($atIndex) && !$atIndex)  {   $isValid = false;  }  else  {   $domain = substr($email, $atIndex+1);   $local = substr($email, 0, $atIndex);   $localLen = strlen($local);   $domainLen = strlen($domain);   if ($localLen < 1 || $localLen > 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;}?>

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The example in this article describes the PHP regex verification Email method. Share it with you for your reference. Details: phpfunction validateEmail...