服務器與客戶端的郵箱地址驗證函數

郵箱地址驗證有很多方法。在浏覽器端，js郵箱驗證可以通過正則表達式檢測。

 代碼如下  

function isEmail(email) {
    return /^((([a-z]|d|[!#$%&'*+-/=?^_`{|}~]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])+(.([a-z]|d|[!#$%&'*+-/=?^_`{|}~]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])+)*)|((x22)((((x20|x09)*(x0dx0a))?(x20|x09)+)?(([x01-x08x0bx0cx0e-x1fx7f]|x21|[x23-x5b]|[x5d-x7e]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(\([x01-x09x0bx0cx0d-x7f]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF]))))*(((x20|x09)*(x0dx0a))?(x20|x09)+)?(x22)))@((([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])*([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF]))).)+(([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])*([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])))$/i.test(email);
}

或

function validateEmail(elementValue)
{   
var emailPattern = /^[a-zA-Z0-9._]+[a-zA-Z0-9]+@[a-zA-Z0-9]+.[a-zA-Z]{2,4}$/;   
return emailPattern.test(elementValue);
}

function checkEmail(mail) {   
return /^[w-]+(.[w-]+)*@([a-z0-9-]+(.[a-z0-9-]+)*?.[a-z]{2,6}|(d{1,3}.){3}d{1,3})(:d{4})?$/.test(mail);
}

調用很簡單:

 代碼如下  

 
if (isEmail('[email protected]')){ console.log(' www.45it.net This is email is valid'); }View Code 

如果是進行服務器端驗證。像php，則最簡單的莫過於:
 

 代碼如下  

$a='/([w._]{2,10})@(w{1,}).([a-z]{2,4})/';
$b='[email protected]';

if(preg_match($a,$b)){
 echo "電子郵件合法";
}else{
 echo "電子郵件不合法啊";
}

你要判斷一整段字符串是否都匹配就要用斷言。如^ $
/^([w._]{2,10})@(w{1,}).([a-z]{2,4})$/
注意頭和尾加上了^ $