PHP正则表达式库实现邮件地址验证

本篇文章主要介绍PHP正则表达式库实现邮件地址验证，感兴趣的朋友参考下，希望对大家有所帮助。

代码如下：

<?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 = "您输入的电子邮件地址合法<br /><br />\n";
      $user_name = preg_replace( $pattern ,"$1", $email_address );
      $domain_name = preg_replace( $pattern ,"$2", $email_address );
      $reply .= "用户名：".$user_name."<br />\n";
      $reply .= "域名：".$domain_name."<br />\n\n";
    }
    else
    {
      $reply = "您输入的电子邮件地址不合法";
    }
  }
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh" xml:lang="zh">
<head>
<title>电子邮件地址验证程序</title>
</head>
<body style="text-align: center;">
<h1>电子邮件地址验证程序</h1>
<form action="#" method="post">
请输入电子邮件地址：<input name="email_address" type="text" style="width: 300px;" /><br />
<input type="submit" value="验证电子邮件地址" />
</form>
<?php
  echo $reply;
?>
</body>
</html>

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