Question

我在html中输入了这个：

<input class"email_address_input" required type="email" id="emailAddress" />

我正在尝试使用正则表达式验证它：

function ContactUs($el){
    this.$el = $el;
    this.$emailAddress = this.$el.find('#emailAddress');
    this.emailValid();
    return this;
}


ContactUs.prototype.isEmail = function(email) {
  var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
  return regex.test(email);
}

ContactUs.prototype.emailValid = function($el) {
        var THIS = this;
        if (THIS.$emailAddress.val().length) {
            THIS.isEmail(THIS.$emailAddress);
        } 
  return THIS;
}

即使我提供了有效的电子邮件格式，我所得到的只是false。

出了什么问题？

Answer 1

关于错误的评论

ContactUs.prototype.emailValid = function($el) {
        var THIS = this;
        if (!THIS.$emailAddress.val().length) {  //This is checking it when there is no length
            THIS.isEmail(THIS.$emailAddress);  //here you are passing  an element, not the value
        } 
  return THIS;  //seems strange you are passing the object and not a false Boolean
}

应该是

ContactUs.prototype.emailValid = function($el) {
  if (this.$emailAddress.val().length) {
    return this.isEmail(this.$emailAddress.val());
  } 
  return false;
}

Answer 2

首先，而不是

if (THIS.$emailAddress.val().length) {
   THIS.isEmail(THIS.$emailAddress.val());
}
return THIS;

使用此：

return THIS.$emailAddress.val().length && THIS.isEmail(THIS.$emailAddress);

此外，您的代码中还有一些非常奇怪的内容。这一行：
```
this.emailValid();
```
没有做任何事情。您已将isEmail添加到ContactUs对象本身。必须在对象的实例上运行isEmail的其他内容，例如：
```
var contactUs = new ContactUs($emailContainer);
var contactUsEmailIsValid = contactus.isEmail();
```
最后，您的电子邮件地址验证程序限制性太强。请先阅读I Knew How To Validate An Email Address Until I Read The RFC。

一般情况下，除非您对正则表达式绝对疯狂，否则最好的办法是确保电子邮件地址中有@符号，并且最后@符号后面的部分包含正确的组件具有最大长度，并且总值不超过最大长度。例如，"a@b"@123.45.89.129.com是完全有效的电子邮件地址。

您确定电子邮件地址实际有效的方式不是这些简单规则，而是通过向该地址发送电子邮件并查看其是否到达，即用户通过向您发送一封您发送给他的代码来向您证明。没有其他方法可以确定电子邮件地址的有效性。每个域名的邮件服务器相当于可以定义自己的电子邮件格式的私人邮局。你的正则表达式不允许不正当地使用许多有效的电子邮件地址，当它不应该作为私人邮局的权限时。

当网站拒绝我想要使用的完全有效的电子邮件地址时，它会让我感到震惊。你正在使用的正则表达式允许@符号前面部分的+符号很好，但在我看来它仍然限制太多。

如果您真的想尝试使用正则表达式进行更多检查，而不会意外地排除有效的电子邮件地址，则可以从实现RFC822的this Perl regex script开始。我不知道它是否适用于javascript（可能不是）但它可能会被转换。您需要删除换行符：

(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
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Answer 3

而不是

THIS.isEmail(THIS.$emailAddress);

试

 return THIS.isEmail(THIS.$emailAddress);

Answer 4

您可以稍微更改正则表达式：

function isValidEmailAddress(emailAddress) {
    var pattern = /^([a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+(\.[a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+)*|"((([ \t]*\r\n)?[ \t]+)?([\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|\\[\x01-\x09\x0b\x0c\x0d-\x7f\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))*(([ \t]*\r\n)?[ \t]+)?")@(([a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.)+([a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.?$/i;
    return pattern.test(emailAddress);
};

function validateEmail() {
  var email = document.getElementById('emailAddress').value;
  console.log(isValidEmailAddress(email));
}

<input class"email_address_input" required type="email" id="emailAddress" />

<input type="button" onclick="validateEmail()" value="Validate" />

Answer 5

为什么不试试jQuery Validation Plugin中的正则表达式？

// http://jqueryvalidation.org/email-method/
email: function( value, element ) {

    // From https://html.spec.whatwg.org/multipage/forms.html#valid-e-mail-address
    // Retrieved 2014-01-14
    // If you have a problem with this implementation, report a bug against the above spec
    // Or use custom methods to implement your own email validation
    return this.optional( element ) || /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/.test( value );
}

如何使用jQuery验证电子邮件地址？

5 个答案: