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>
总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
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以上就是php正则表达式库实现邮件地址验证的详细内容。