PHP email Regular expression validation, e-mail address regular expression _php tutorial

PHP email Regular expression validation, e-mail address regular expression

The most common verification we encounter is email address verification. Common on the site. Various Web page scripts are also commonly used "regular expressions" (regular expression) to verify the e-mail address we enter and determine whether it is legal. Some can also break down the user name and domain name. Now implement the E-mail address verification program in PHP, using the PHP regular expression library.
The source code is as follows:

<?php  Header ("content-type:text/html; Charset=utf-8 ");  $reply = "";  if (Isset ($_post["email_address"))  {    $email _address = $_post["email_address"];    $pattern = "/^ ([0-9a-za-z\\-_\\.] +) @ ([0-9a-z]+\\. [A-z] {2,3} (\\. [A-z] {2})?) $/i ";    if (Preg_match ($pattern, $email _address))    {      $reply = "The email address you entered is legal

\ n ";      $user _name = preg_replace ($pattern, "$", $email _address);      $domain _name = preg_replace ($pattern, "$", $email _address);      $reply. = "User name:" $user _name. "
\ n ";      $reply. = "Domain name:" $domain _name. "
\ n ";    }    else    {      $reply = "The e-mail address you entered is not valid";    }  }? >e-mail Address verification Program
e-mail Address verification Program
<?php  echo $reply;? >

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