PHP正则表达式

【转】PHP正则表达式 验证电子邮件地址

 

  我们最经常遇到的验证,就是电子邮件地址验证。网站上常见。各种网页脚本也都常用“正则表达式”(regular expression)对我们输入的电子邮件地址进行验证,判断是否合法。有的还能分解出用户名和域名。现在用PHP语言实现一下电子邮件地址验证程序,用的是PHP正则表达式库。

  源代码如下:

<?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>
 
 
 
posted @ 2018-01-11 22:48  Fairyspace  阅读(128)  评论(0编辑  收藏  举报