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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JavaScript語言實現一下電子郵件地址驗證程式，用的是JavaScript語言的Regex庫。
原始碼如下，該網頁已在IE、Firefox、Chrome上驗證通過：
<!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><meta http-equiv="content-type" content="text/html; charset=UTF-8" /><title>電子郵件地址驗證程式</title><script language="javascript" type="text/javascript">//<![CDATA[ function check( email_address ) { var regex = /^([0-9A-Za-z\-_\.]+)@([0-9a-z]+\.[a-z]{2,3}(\.[a-z]{2})?)$/g; if ( regex.test( email_address ) ) { var user_name = email_address.replace( regex, "$1" ); var domain_name = email_address.replace( regex, "$2" ); var alert_string = "您輸入的電子郵件地址合法\n\n"; alert_string += "使用者名稱：" + user_name + "\n"; alert_string += "網域名稱：" + domain_name; window.alert( alert_string ); return true; } else { window.alert( "您輸入的電子郵件地址不合法" ); return false; } }//]]></script></head><body style="text-align: center;"><h1>電子郵件地址驗證程式</h1>請輸入電子郵件地址：<input id="email_address" type="text" style="width: 300px;" /><br /><input type="button" value="驗證電子郵件地址" onclick="return check(document.getElementById('email_address').value);" /></body></html>Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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