PHP regular expression to verify email address
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>原文地址：
https://www.cnblogs.com/yejianfei/archive/2012/10/18/2729526.html
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