一 代碼
<!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"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>驗證電子郵箱格式</title></head><body><form name="form" method="post" action="#"><label>請輸入郵箱：</label><input type="text" name="mail" id="mail" value="<?php echo $_POST['mail'];?>"><input type="submit" name="sub" value="測試"><p></form><?php $checkmail="/\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/";//定義Regex if(isset($_POST['mail']) && $_POST['mail']!=""){//判斷文字框中是否有值 $mail=$_POST['mail']; //將傳過來的值賦給變數$mail if(preg_match($checkmail,$mail)){//用Regex函數進行判斷 echo "電子郵箱格式正確"; }else{ echo "電子郵箱格式不正確"; } }?></body></html>
二 運行結果
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