PHP Regular Expression library for email address verification

This article mainly introduces the PHP regular expression library implementation of email address verification, interested in the friend's reference, I hope to help you.

The 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 <br/><br/>\n";      $user _name = preg_replace ($pattern, "$", $email _address);      $domain _name = preg_replace ($pattern, "$", $email _address); $reply. = "User name:" $user _name. "      <br/>\n "; $reply. = "Domain name:" $domain _name. "    <br/>\n\n ";    } else {$reply = "The e-mail address you entered is not valid"; }}?><! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">

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