JavaScript正则表达式电子邮件验证 [英] JavaScript Regular Expression Email Validation

问题描述

此代码始终提示null，这意味着字符串与表达式不匹配。

< pre class =lang-js prettyprint-override> var pattern =^ \w + @ [a-zA-Z _] +？\。[a-zA-Z] {2,3 } $;

function isEmailAddress（str）{

str =[e-mail];

alert（str.match（pattern））;
返回str.match（pattern）;

}


解决方案

如果你将你的正则表达式定义为一个字符串，然后所有反斜杠都需要转义，所以你应该使用'\\\\'代替'\\\'。

或者，将其定义为正则表达式：

  var pattern = / ^ \w + @ [a-zA-Z _] +？ \ [A-ZA-Z] {2,3} $ /。 
  

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BTW，请不要验证电子邮件地址客户端。无论如何，你的正则表达式太简单了，无法通过实现。

在这里看到真实的东西： http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html

This code is always alerting out "null", which means that the string does not match the expression.

var pattern = "^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$"; 

function isEmailAddress(str) {

    str = "[e-mail]";      

    alert(str.match(pattern)); 
    return str.match(pattern);    

}

解决方案

If you define your regular expression as a string then all backslashes need to be escaped, so instead of '\w' you should have '\\w'.

Alternatively, define it as a regular expression:

var pattern = /^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$/; 

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BTW, please don't validate email addresses on the client-side. Your regular expression is way too simple to pass for a solid implementation anyway.

See the real thing here: http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html

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