PHP regular expression to verify email address-PHP Tutorial-php.cn

PHP regular expression to verify email address

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Release： 2023-03-24 13:26:01

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这篇文章介绍的内容是关于PHP正则表达式验证电子邮件地址，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

　　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：
复制代码

<?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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原文地址：
https://www.cnblogs.com/yejianfei/archive/2012/10/18/2729526.html