我們最經常遇到的驗證，就是電子郵件地址驗證。網站上常見。各種網頁指令碼也都常用“Regex”（regular expression）對我們輸入的電子郵件地址進行驗證，判斷是否合法。有的還能分解出使用者名稱和網域名稱。現在用PHP語言實現一下電子郵件地址驗證程式，用的是PHPRegex庫。
原始碼如下：
<?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 = "您輸入的電子郵件地址合法<br /><br />\n"; $user_name = preg_replace( $pattern ,"$1", $email_address ); $domain_name = preg_replace( $pattern ,"$2", $email_address ); $reply .= "使用者名稱：".$user_name."<br />\n"; $reply .= "網域名稱：".$domain_name."<br />\n\n"; } else { $reply = "您輸入的電子郵件地址不合法"; } }?><!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>電子郵件地址驗證程式</title></head><body style="text-align: center;"><h1>電子郵件地址驗證程式</h1><form action="#" method="post">請輸入電子郵件地址：<input name="email_address" type="text" style="width: 300px;" /><br /><input type="submit" value="驗證電子郵件地址" /></form><?php echo $reply;?></body></html>
以上就是為大家分享的php郵箱地址Regex驗證，希望對大家的學習有所協助。
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