PHP Regular Expression Verification e-mail address

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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:
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<?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 "> 
Original address:
Https://www.cnblogs.com/yejianfei/archive/2012/10/18/2729526.html

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