blocks|key|1541621|text|这就是我在我的页面上使用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1541622|http://www.zparacha.com/validate-email-address-using-javascript-regular-expression/|offset|length|1541623|/%5E[a-zA-Z0-9._-]%2B@[a-zA-Z0-9.-]%2B\.[a-zA-Z]{2,6}$/|style|CODE|1541624|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2B|0|0|0|1D|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@$D|S|E|T|1|U]]|A|$]]|$1|F|3|G|5|6|7|V|8|@$D|W|E|X|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]]]

<p>this is the one i am using on my page.</p>

<p><a href="http://www.zparacha.com/validate-email-address-using-javascript-regular-expression/" rel="noreferrer">http://www.zparacha.com/validate-email-address-using-javascript-regular-expression/</a></p>

<p><code>/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,6}$/</code></p>


blocks|key|1326469|text|我使用这个函数已经有一段时间了。它返回一个布尔值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1326470|//+Validates+email+address+of+course.
function+validEmail(e)+{
++++var+filter+=+/%5E\s*[\w\-\%2B_]%2B(\.[\w\-\%2B_]%2B)*\@[\w\-\%2B_]%2B\.[\w\-\%2B_]%2B(\.[\w\-\%2B_]%2B)*\s*$/;
++++return+String(e).search+(filter)+!=+-1;
}|code-block|syntax|javascript|1326471|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>I've been using this function for a while. it returns a boolean value.</p>

<pre><code>// Validates email address of course.
function validEmail(e) {
    var filter = /^\s*[\w\-\+_]+(\.[\w\-\+_]+)*\@[\w\-\+_]+\.[\w\-\+_]+(\.[\w\-\+_]+)*\s*$/;
    return String(e).search (filter) != -1;
}
</code></pre>


blocks|key|1326422|text|您可能对this+question+(或this+one)感兴趣，它强调了这样一个事实:通过正则表达式识别有效的电子邮件地址是一个很难解决的问题(如果完全可以解决的话)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1326423|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/156430/regexp-recognition-of-email-address-hard|1|https://stackoverflow.com/questions/201323/what-is-the-best-regular-expression-for-validating-email-addresses^0|4|D|0|K|8|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

<p>You may be interested in <a href="https://stackoverflow.com/questions/156430/regexp-recognition-of-email-address-hard">this question</a> (or <a href="https://stackoverflow.com/questions/201323/what-is-the-best-regular-expression-for-validating-email-addresses">this one</a>), which highlights the fact that identifying valid email addresses via regexps is a very hard problem to solve (if at all solvable)</p>


blocks|key|1541961|text|有时大多数注册和登录页面需要验证电子邮件。在此示例中，您将学习简单的电子邮件验证。首先使用html格式的文本输入和如下所示的按钮输入|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1541962|<input+type='text'+id='txtEmail'/>
<input+type='submit'+name='submit'+onclick='checkEmail();'/>

<script>
++++function+checkEmail()+{
++++++++var+email+=+document.getElementById('txtEmail');
++++++++var+filter+=+/%5E(([%5E<>()\[\]\\.,;:\s@"]%2B(\.[%5E<>()\[\]\\.,;:\s@"]%2B)*)%7C(".%2B"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])%7C(([a-zA-Z\-0-9]%2B\.)%2B[a-zA-Z]{2,}))$/;
++++++++if+(!filter.test(email.value))+{
++++++++++++alert('Please+provide+a+valid+email+address');
++++++++++++email.focus;
++++++++++++return+false;
++++++++}
++++}
</script>|code-block|syntax|javascript|1541963|您还可以使用此正则表达式进行检查|1541964|<input+type='text'+id='txtEmail'/>
<input+type='submit'+name='submit'+onclick='checkEmail();'/>

<script>
++++function+checkEmail()+{

++++++++var+email+=+document.getElementById('txtEmail');
++++++++var+filter+=+/%5E([a-zA-Z0-9_\.\-])%2B\@(([a-zA-Z0-9\-])%2B\.)%2B([a-zA-Z0-9]{2,4})%2B$/;

++++++++if+(!filter.test(email.value))+{
++++++++++++alert('Please+provide+a+valid+email+address');
++++++++++++email.focus;
++++++++++++return+false;
++++++++}
++++}
</script>|1541965|检查此演示输出，您可以在此处查看|1541966|​|1541967|function+checkEmail()+{
++++++++var+email+=+document.getElementById('txtEmail');
++++++++var+filter+=+/%5E(([%5E<>()\[\]\\.,;:\s@"]%2B(\.[%5E<>()\[\]\\.,;:\s@"]%2B)*)%7C(".%2B"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])%7C(([a-zA-Z\-0-9]%2B\.)%2B[a-zA-Z]{2,}))$/;
++++++++if+(!filter.test(email.value))+{
++++++++++++alert('Please+provide+a+valid+email+address');
++++++++++++email.focus;
++++++++++++return+false;
++++++++}
++++}|1541968|<input+type='text'+id='txtEmail'/>
<input+type='submit'+name='submit'+onclick='checkEmail();'/>|1541969|1541970|如果电子邮件无效，则发出警报消息，如果电子邮件有效，则没有警报消息。有关正则表达式的更多信息|1541971|https://www.w3schools.com/jsref/jsref_obj_regexp.asp|offset|length|1541972|希望能对你有所帮助|1541973|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|0|0|0|0|0|1G|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1A|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1C|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1D|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|1E|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|S|3|N|5|6|7|1G|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1H|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1I|8|@]|9|@$X|1J|Y|1K|1|1L]]|A|$]]|$1|Z|3|10|5|6|7|1M|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|12|$13|$5|14|15|16|A|$17|W]]]]

<p>Sometimes most of the registration and login page need to validate email. In this example you will learn simple email validation.
First take a text input in html and a button input like this</p>

<pre><code>&lt;input type='text' id='txtEmail'/&gt;
&lt;input type='submit' name='submit' onclick='checkEmail();'/&gt;

&lt;script&gt;
    function checkEmail() {
        var email = document.getElementById('txtEmail');
        var filter = /^(([^&lt;&gt;()\[\]\\.,;:\s@"]+(\.[^&lt;&gt;()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
        if (!filter.test(email.value)) {
            alert('Please provide a valid email address');
            email.focus;
            return false;
        }
    }
&lt;/script&gt;
</code></pre>

<p>you can also check using this regular expression</p>

<pre><code>&lt;input type='text' id='txtEmail'/&gt;
&lt;input type='submit' name='submit' onclick='checkEmail();'/&gt;

&lt;script&gt;
    function checkEmail() {

        var email = document.getElementById('txtEmail');
        var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

        if (!filter.test(email.value)) {
            alert('Please provide a valid email address');
            email.focus;
            return false;
        }
    }
&lt;/script&gt;
</code></pre>

<p>Check this demo output which you can check here</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>function checkEmail() {
        var email = document.getElementById('txtEmail');
        var filter = /^(([^&lt;&gt;()\[\]\\.,;:\s@"]+(\.[^&lt;&gt;()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
        if (!filter.test(email.value)) {
            alert('Please provide a valid email address');
            email.focus;
            return false;
        }
    }</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;input type='text' id='txtEmail'/&gt;
&lt;input type='submit' name='submit' onclick='checkEmail();'/&gt;</code></pre>
</div>
</div>
</p>

<p>if email invalid then give alert message , if valid email then no alert message .
for more info about regular expression</p>

<p><a href="https://www.w3schools.com/jsref/jsref_obj_regexp.asp" rel="nofollow noreferrer">https://www.w3schools.com/jsref/jsref_obj_regexp.asp</a></p>

<p>hope it will help you</p>


blocks|key|1326820|text|使用更简单的regex|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1326821|这就是它：|1326822|var+regexEmail+=+/\w%2B([-%2B.']\w%2B)*@\w%2B([-.]\w%2B)*\.\w%2B([-.]\w%2B)*/;
var+email+=+document.getElementById("txtEmail");

if+(regexEmail.test(email.value))+{
++++alert("It's+Okay")
}+else+{
++++alert("Not+Okay")

}|code-block|syntax|javascript|1326823|祝好运。|1326824|entityMap|0|LINK|mutability|MUTABLE|url|/questions/tagged/regex^0|6|5|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

<p>with more simple <a href="/questions/tagged/regex" class="post-tag" title="show questions tagged 'regex'" rel="tag">regex</a></p>

<p>Here it is :</p>

<pre><code>var regexEmail = /\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;
var email = document.getElementById("txtEmail");

if (regexEmail.test(email.value)) {
    alert("It's Okay")
} else {
    alert("Not Okay")

}
</code></pre>

<p>good luck.</p>


blocks|key|1326745|text|function+isEmailAddress(str)+{
+++var+pattern+=/%5E\w%2B([\.-]?\w%2B)*@\w%2B([\.-]?\w%2B)*(\.\w{2,3})%2B$/;
+++return+pattern.test(str);++//+returns+a+boolean+
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1326746|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function isEmailAddress(str) {
   var pattern =/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
   return pattern.test(str);  // returns a boolean 
}
</code></pre>


blocks|key|1541552|text|你可能会对这个page感兴趣，它列出了验证电子邮件地址的正则表达式，涵盖了更一般的情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1541553|entityMap|0|LINK|mutability|MUTABLE|url|http://www.regular-expressions.info/email.html^0|7|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<p>You may be interested in having a look at this <a href="http://www.regular-expressions.info/email.html" rel="noreferrer">page</a> it list regular expressions for validating email address that cover more general cases.</p>


blocks|key|1326734|text|我一直在用这个……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1326735|/%5E[\w._-]%2B[%2B]?[\w._-]%2B@[\w.-]%2B\.[a-zA-Z]{2,6}$/|code-block|syntax|javascript|1326736|它允许在@+(xyz%2Babc@xyz.com)之前使用该%2B|offset|length|style|CODE|1326737|entityMap^0|0|0|4|1|6|H|S|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|N|$]]

<p>I have been using this one....</p>

<pre><code>/^[\w._-]+[+]?[\w._-]+@[\w.-]+\.[a-zA-Z]{2,6}$/
</code></pre>

<p>It allows that <code>+</code> before <code>@</code> <code>(xyz+abc@xyz.com)</code></p>


blocks|key|1542051|text|派对来晚了点，但这没什么.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1542052|function+isEmailValid(emailAdress)+{
++++var+EMAIL_REGEXP+=+new+RegExp('%5E[a-z0-9]%2B(\.[_a-z0-9]%2B)*@[a-z0-9-]%2B(\.[a-z0-9-]%2B)*(\.[a-z]{2,15})$',+'i');
++++return+EMAIL_REGEXP.test(emailAdress)
}|code-block|syntax|javascript|1542053|http://jsfiddle.net/yrshaikh/xvd6H/|offset|length|1542054|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|Z|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@$I|U|J|V|1|W]]|A|$]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|H]]]]

<p>Little late to the party, but here goes nothing...</p>

<pre><code>function isEmailValid(emailAdress) {
    var EMAIL_REGEXP = new RegExp('^[a-z0-9]+(\.[_a-z0-9]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,15})$', 'i');
    return EMAIL_REGEXP.test(emailAdress)
}
</code></pre>

<p><a href="http://jsfiddle.net/yrshaikh/xvd6H/" rel="nofollow">http://jsfiddle.net/yrshaikh/xvd6H/</a></p>


blocks|key|1541826|text|你也可以试试这个表达式，我已经在很多电子邮件地址上测试过了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1541827|var+pattern+=+/%5E[A-Za-z0-9._%25%2B-]%2B@([A-Za-z0-9-]%2B\.)%2B([A-Za-z0-9]{2,4}%7Cmuseum)$/;|code-block|syntax|javascript|1541828|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>You can also try this expression, I have tested it against many email addresses.</p>

<pre><code>var pattern = /^[A-Za-z0-9._%+-]+@([A-Za-z0-9-]+\.)+([A-Za-z0-9]{2,4}|museum)$/;
</code></pre>


blocks|key|1326826|text|var+emailRegex+=+/%5E[A-Z0-9_'%25=%2B!`#~$*?%5E{}&%7C-]%2B([\.][A-Z0-9_'%25=%2B!`#~$*?%5E{}&%7C-]%2B)*@[A-Z0-9-]%2B(\.[A-Z0-9-]%2B)%2B$/i;
if(emailRegex.test('yoursamplemail'))
alert('valid');
else
alert('invalid');|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1326827|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var emailRegex = /^[A-Z0-9_'%=+!`#~$*?^{}&amp;|-]+([\.][A-Z0-9_'%=+!`#~$*?^{}&amp;|-]+)*@[A-Z0-9-]+(\.[A-Z0-9-]+)+$/i;
if(emailRegex.test('yoursamplemail'))
alert('valid');
else
alert('invalid');
</code></pre>


blocks|key|1541703|text|请记住，a-z、A-Z、0-9、.、_和-不是电子邮件地址开头的唯一有效字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1541704|例如，someone%2Belse@gmail.com允许你在地址中加一个"%2B“号来”伪造“不同的电子邮件(例如，Gmail也会收到发送到Gmail的电子邮件)。|1541705|Micky.o‘’finnagan@whereever.com不会喜欢你阻止他们输入地址的代码……撇号在电子邮件地址中完全有效。|1541706|上面提到的有效电子邮件地址的闭合“检查”，正如它自己所说的，是相当天真的：|1541707|http://code.google.com/p/closure-library/source/browse/trunk/closure/goog/format/emailaddress.js#198|offset|length|1541708|我建议使用非常开放的客户端代码，然后使用更多的重量级代码，比如发送一封带有链接的电子邮件，以真正检查它是否“有效”(对于他们的提供者来说，语法上是有效的，并且没有拼写错误)。|1541709|如下所示：|1541710|var+pattern+=+/[%5E@]%2B@[-a-z\.]\.[a-z\.]{2,6}/|style|CODE|1541711|请记住，理论上你可以在一个电子邮件地址中有两个@符号，我甚至没有在域名中包含latin1以外的字符！|1541712|http://www.eurid.eu/en/eu-domain-names/idns-eu|1541713|http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx|1541714|entityMap|0|LINK|mutability|MUTABLE|url|1|2^0|0|0|0|0|0|2S|0|0|0|0|0|18|0|0|0|1A|1|0|0|2I|2|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1A|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1B|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1C|8|@]|9|@$J|1D|K|1E|1|1F]]|A|$]]|$1|L|3|M|5|6|7|1G|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1H|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1I|8|@$J|1J|K|1K|R|S]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1L|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1M|8|@]|9|@$J|1N|K|1O|1|1P]]|A|$]]|$1|X|3|Y|5|6|7|1Q|8|@]|9|@$J|1R|K|1S|1|1T]]|A|$]]|$1|Z|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|I]]|16|$5|12|13|14|A|$15|W]]|17|$5|12|13|14|A|$15|Y]]]]

<p>You should bear in mind that a-z, A-Z, 0-9, ., _ and - are not the only valid characters in the start of an email address.</p>

<p>Gmail, for example, lets you put a "+" sign in the address to "fake" a different email (e.g. someone@gmail.com will also get email sent to someone+else@gmail.com).</p>

<p>micky.o'finnagan@wherever.com would not appreciate your code stopping them entering their address ... apostrophes are perfectly valid in email addresses.</p>

<p>The Closure "check" of a valid email address mentioned above is, as it states itself, quite naïve:</p>

<p><a href="http://code.google.com/p/closure-library/source/browse/trunk/closure/goog/format/emailaddress.js#198" rel="nofollow">http://code.google.com/p/closure-library/source/browse/trunk/closure/goog/format/emailaddress.js#198</a></p>

<p>I recommend being very open in your client side code, and then much more heavyweight like sending an email with a link to really check that it's "valid" (as in - syntactically valid for their provider, and also not misspelled).</p>

<p>Something like this:</p>

<p><code>var pattern = /[^@]+@[-a-z\.]\.[a-z\.]{2,6}/</code></p>

<p>Bearing in mind that theoretically you can have two @ signs in an email address, and I haven't even included characters beyond latin1 in the domain names!</p>

<p><a href="http://www.eurid.eu/en/eu-domain-names/idns-eu" rel="nofollow">http://www.eurid.eu/en/eu-domain-names/idns-eu</a></p>

<p><a href="http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx" rel="nofollow">http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx</a></p>


blocks|key|1542019|text|您可以向String对象添加函数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1542020|//Add+this+wherever+you+like+in+your+javascript+code
String.prototype.isEmail+=+function()+{
++++return+!!this.match(/%5E\w%2B@[a-zA-Z_]%2B?\.[a-zA-Z]{2,3}$/);
}

var+user_email+=+"test.email@example.com";

if(user_email.isEmail())+{
++++//Email+is+valid+!
}+else+{
++++//Email+is+invalid+!
}|code-block|syntax|javascript|1542021|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>You can add a function to String Object</p>

<pre><code>//Add this wherever you like in your javascript code
String.prototype.isEmail = function() {
    return !!this.match(/^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$/);
}

var user_email = "test.email@example.com";

if(user_email.isEmail()) {
    //Email is valid !
} else {
    //Email is invalid !
}
</code></pre>


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

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

function isEmailAddress(str) {

    str = "azamsharp@gmail.com";      

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

}
</code></pre>


JavaScript Regular Expression Email Validation

这段代码总是警告"null"，这意味着字符串与表达式不匹配。var pattern = "^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$"; function isEmailAddress(str) {    str = "azamsharp@gmail.com";          alert(str.match(pattern));     return str.match(

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