电子邮件验证JavaScript [英] email validation javascript

问题描述

 函数checkTextBox（textBox）
 {
 if（！checkValidity（textBox.getValue（）））
 displayError（Error title，Error message，textBox）; 
 textBox.focus（）; 
} 
 
函数checkValidity（e）
 {
 var email; 
 email =/^[^@]+@[^@]+.[a-z]{2,}$/i; 
 
 if（！e.match（email））{
 return false; 
 else 
返回true; 
} 
} 
  

编辑：回答赞赏！感谢！

/rfc5322#section-3.4rel =noreferrer> RFC 5322，§3.4 。相关的非终端是 addr-spec 。由于领域规范的复杂性和支持陈旧，过时的形式，这个定义变得有些诡异。但是，您可以对大多数表单进行过度逼近：

  ^ [ -  0-9A-Za-z！＃ $％&放大器; '* + / = ^ _`{|}〜] + @  -  0-9A-ZA-Z＃$％&放大器;？！' * + / = ^ _`{|}〜？ ] + 
  

请注意，有大量的合法字符。大多数reg-exs都会列出错误。是的，所有这些字符在电子邮件地址中都是合法的。

这个正则表达式不匹配一些非常用的形式，比如noodle soup @ 9@ [what.example.com] - 这是一个合法的电子邮件地址！

is this javascript function (checkValidity) correct?

function checkTextBox(textBox)
{
   if (!checkValidity(textBox.getValue()))
       displayError("Error title", "Error message", textBox);
       textBox.focus();
}

function checkValidity(e) 
{
    var email;
    email = "/^[^@]+@[^@]+.[a-z]{2,}$/i";

    if (!e.match(email)){
            return false;
    else
            return true;
    }
}

EDIT: All the answers appreciated! Thanks!

解决方案

E-mail address are defined in RFC 5322, § 3.4. The relevant non-terminal is addr-spec. The definition turns out to be somewhat squirelly, due to both the complications of domain specifications and supporting old, obsolete forms. However, you can do an over-approximation for most forms with:

^[-0-9A-Za-z!#$%&'*+/=?^_`{|}~.]+@[-0-9A-Za-z!#$%&'*+/=?^_`{|}~.]+

Notice that there are a very large number of legal characters. Most reg-exs get the list wrong. Yes, all those characters are legal in an e-mail address.

This regex will not match some very uncommon used forms like "noodle soup @ 9"@[what the.example.com] -- which is a legal e-mail address!

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