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比较正宗的验证邮箱的正则表达式js代码详解_正则表达式

May 25, 2016 pm 05:07 PM
regular expression Verify email

邮箱正则最正宗的一条正则语句是^[a-z0-9]+([._\\-]*[a-z0-9])*@([a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+$ 下面我们来讲解一下

fuchangxi的正则:

代码如下:

/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/
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开始必须是一个或者多个单词字符或者是-,加上@,然后又是一个或者多个单词字符或者是-。然后是点“.”和单词字符和-的组合,可以有一个或者多个组合。

代码如下:

<script type="text/javascript"> 
function isEmail(str){ 
var reg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/; 
return reg.test(str); 
} 
var str = &#39;test@hotmail.com&#39;; 
document.write(isEmail(str)+&#39;<br />&#39;); 
var str2 = &#39;test@sima.vip.com&#39;; 
document.write(isEmail(str2)+&#39;<br />&#39;); 
var str3 = &#39;te-st@qq.com.cn&#39;; 
document.write(isEmail(str3)+&#39;<br />&#39;); 
var str4 = &#39;te_st@sima.vip.com&#39;; 
document.write(isEmail(str4)+&#39;<br />&#39;); 
var str5 = &#39;te.._st@sima.vip.com&#39;; 
document.write(isEmail(str5)+&#39;<br />&#39;); 
</script>
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我不太了解邮箱的具体规则。感觉这个正则比较简单

统计一下邮箱@前缀的几种类型

1、纯数字
比如:123456@jb51.net
2、纯字母
3、字母数字混合
4、带点的
比如:web.blue@jb51.net
5、带下划线
比如:web_blue@jb51.net
6、带连接线
比如:web-blue@jb51.net
邮箱域至少有一个“.”和两个单词,再严格点那么最后的顶级域至少要2个字母,最大呢?以域名“name”为准,那么最大就是4,宽松点就设为5吧^_^。

当然以上不可能的情况:以“_”或“-”开头或者结尾,包含特殊符号的。
因此,我给出的正则表达式如下:

^[A-Za-zd]+([-_.][A-Za-zd]+)*@([A-Za-zd]+[-.])+[A-Za-zd]{2,5}$

代码如下:

<script type="text/javascript"> 
fChkMail=function(szMail){ 
var szReg=/^[A-Za-zd]+([-_.][A-Za-zd]+)*@([A-Za-zd]+[-.])+[A-Za-zd]{2,5}$/; 
var bChk=szReg.test(szMail); 
return bChk; 
} 
</script> 
<input type="text" id="Mail" value="" /> 
<input type="button" value="验证邮箱地址" onclick="alert(fChkMail(document.getElementById(&#39;Mail&#39;).value));" /> 
<p>邮箱不能以 - _ .以及其它特殊字符开头和结束</p> 
<p>邮箱域名结尾为2~5个字母,比如cn、com、name</p>
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