I&#39;d like to check if the user input is an email address in JavaScript, before sending it to a server or attempting to send an email to it, to prevent the most basic mistyping. How could I achieve this?

How can I validate an email address in JavaScript?

I&#39;m not asking about full email validation.

I just want to know what are allowed characters in `user-name` and `server` parts of email address. This may be oversimplified, maybe email adresses can take other forms, but I don&#39;t care. I&#39;m asking about only this simple form: `user-name@server` (e.g. wild.wezyr@best-server-ever.com) and allowed characters in both parts.

What characters are allowed in an email address?

What is the most elegant code to validate that a string is a valid email address?

C# code to validate email address

What&#39;s a good technique for validating an e-mail address (e.g. from a user input field) in Android? [org.apache.commons.validator.routines.EmailValidator][1] doesn&#39;t seem to be available. Are there any other libraries doing this which are included in Android already or would I have to use RegExp?


  [1]: http://commons.apache.org/validator/apidocs/org/apache/commons/validator/routines/EmailValidator.html

How should I validate an e-mail address?

I have this function to validate an email addresses:

    function validateEMAIL($EMAIL) {
        $v = &quot;/[a-zA-Z0-9_-.+]+@[a-zA-Z0-9-]+.[a-zA-Z]+/&quot;;

        return (bool)preg_match($v, $EMAIL);
    }

Is this okay for checking if the email address is valid or not?

How to validate an email address in PHP

Is there a good way to check a form input using regex to make sure it is a proper style email address? Been searching since last night and everybody that has answered peoples questions regarding this topic also seems to have problems with it if it is a subdomained email address.

How to check for valid email address?

How can we perform `Email Validation` on `edittext` in `android` ? I have gone through google &amp; SO but I didn&#39;t find out a simple way to validate it.

Email Address Validation in Android on EditText

&gt; **Possible Duplicate:**  
&gt; [Best practices for validating email address in Objective-C on iOS 2.0?](https://stackoverflow.com/questions/800123/best-practices-for-validating-email-address-in-objective-c-on-ios-2-0)  

&lt;!-- End of automatically inserted text --&gt;

I am developing an iPhone application where I need the user to give his email address at login.

What is the best way to check if an email address is a valid email address?


Check that an email address is valid on iOS

I&#39;m not too sure how to do this.  I need to validate email addresses using regex with something like this:

    [a-z0-9!#$%&amp;&#39;*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&amp;&#39;*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[A-Z]{2}|com|org|net|edu|gov|mil|biz|info|mobi|name|aero|asia|jobs|museum)

Then I need to run this in a jQuery function like this:   

    $j(&quot;#fld_emailaddress&quot;).live(&#39;change&#39;,function() { 
    var emailaddress = $j(&quot;#fld_emailaddress&quot;).val();
    
    // validation here? 
    
    if(emailaddress){}
    
    // end validation
    
    $j.ajax({  
            type: &quot;POST&quot;,  
             url: &quot;../ff-admin/ff-register/ff-user-check.php&quot;,  
            data: &quot;fld_emailaddress=&quot;+ emailaddress,  
            success: function(msg)
            { 
    			if(msg == &#39;OK&#39;) { 
    			$j(&quot;#fld_username&quot;).attr(&#39;disabled&#39;,false); 
    			$j(&quot;#fld_password&quot;).attr(&#39;disabled&#39;,false); 
    			$j(&quot;#cmd_register_submit&quot;).attr(&#39;disabled&#39;,false); 
    			$j(&quot;#fld_emailaddress&quot;).removeClass(&#39;object_error&#39;); // if necessary
    			$j(&quot;#fld_emailaddress&quot;).addClass(&quot;object_ok&quot;);
    			$j(&#39;#email_ac&#39;).html(&#39;&amp;nbsp;&lt;img src=&quot;img/cool.png&quot; align=&quot;absmiddle&quot;&gt; &lt;font color=&quot;Green&quot;&gt; Your email &lt;strong&gt;&#39;+ emailaddress+&#39;&lt;/strong&gt; is OK.&lt;/font&gt;  &#39;);
    			} else {  
    			$j(&quot;#fld_username&quot;).attr(&#39;disabled&#39;,true); 
    			$j(&quot;#fld_password&quot;).attr(&#39;disabled&#39;,true); 
    			$j(&quot;#cmd_register_submit&quot;).attr(&#39;disabled&#39;,true);  
    			$j(&quot;#fld_emailaddress&quot;).removeClass(&#39;object_ok&#39;); // if necessary
    			$j(&quot;#fld_emailaddress&quot;).addClass(&quot;object_error&quot;);
    			$j(&#39;#email_ac&#39;).html(msg);
    			}
            }
    	 });
    });

Where does the validation go and what is the expression?

Validating email addresses using jQuery and regex

I have some problems with the validation of a Email.

In my Model:

    [Required(ErrorMessage = &quot;Field can&#39;t be empty&quot;)]
    [DataType(DataType.EmailAddress, ErrorMessage = &quot;E-mail is not valid&quot;)]
    public string ReceiverMail { get; set; }
    
In my view:

    &lt;script src=&quot;@Url.Content(&quot;~/Scripts/jquery.validate.min.js&quot;)&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt;
    &lt;script src=&quot;@Url.Content(&quot;~/Scripts/jquery.validate.unobtrusive.min.js&quot;)&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt;

    @Html.TextBoxFor(m =&gt; m.ReceiverMail, new { @placeholder=&quot;E-mail&quot;}) &lt;br /&gt;
    @Html.ValidationMessageFor(m =&gt; m.ReceiverMail)
    
Now it is correctly showing me &quot;Field can&#39;t be empty&quot; when you leave the field empty.
But when you fill in an invalid email address like: &quot;fwenrjfw&quot; then the form does not say &quot;E-mail is not valid&quot;.

How can I get the form to validate the input as an email address? I am looking for some help with this. 

Email address validation using ASP.NET MVC data type attributes

What is the cleanest way to validate an email address that a user enters on iOS 2.0?

**NOTE**: This is a historical question that is specific to iOS 2.0 and due to its age and how many other questions are linked to it it cannot be retired and MUST NOT be changed to a &quot;modern&quot; question.

What are best practices for validating email addresses on iOS 2.0

I&#39;m writing a very simple mock-up to demonstrate some HTML5 form-validation. However, I noticed the email validation doesn&#39;t check for a dot in the address, nor does it check for characters following said dot.

In other words, &quot;john@doe&quot; is considered valid, when it&#39;s clearly not a valid email address; &quot;doe&quot; isn&#39;t a domain.

This is how I&#39;m coding my email field:

    &lt;input type=&quot;email&quot; required /&gt;

Is that not enough?

Check this [fiddle][1] to see what I mean.

  [1]: http://jsfiddle.net/yKf2U/

Note: I know how to accomplish this via a RegEx pattern instead. I&#39;m just wondering how someone could get away with using the email type instead.

Why does HTML5 form-validation allow emails without a dot?

I have come across this [PHP code to check email address using SMTP without sending an email][1].

Has anyone tried anything similar or does it work for you? Can you tell if an email customer / user enters is correct &amp; exists?


  [1]: http://www.webdigi.co.uk/blog/2009/how-to-check-if-an-email-address-exists-without-sending-an-email/

How to check if an email address exists without sending an email?

how to check the text of `edittext` is email address or not without using `javascript` and regular expression?
Here I used `inputtype=&quot;textEmailAddress&quot;` this is working but no error message is display.

How to check edittext&#39;s text is email address or not?

How can I validate the input value is a valid email address using php5. Now I am using this code 

    function isValidEmail($email){ 
         $pattern = &quot;^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$&quot;; 
          
         if (eregi($pattern, $email)){ 
            return true; 
         } 
         else { 
            return false; 
         }    
    } 

but it shows deprecated error. How can I fix this issue. Please help me.



How to validate an Email in PHP?

I have the following Regular Expression which matches an email address format:

    ^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$

This is used for validation with a form using JavaScript. However, this is an optional field. Therefore how can I change this regex to match an email address format, or an empty string?

From my limited regex knowledge, I think `\b` matches an empty string, and `|` means &quot;Or&quot;, so I tried to do the following, but it didn&#39;t work:

    ^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$|\b

Regular expression which matches a pattern, or is an empty string

When users create an account on my site I want to make server validation for emails to not accept *every* input.

I will send a confirmation, in a way to do a [handshake validation][1].

I am looking for **something simple, not *the best***, but not too simple that doesn&#39;t validate anything. I don&#39;t know where limitation must be, since any regular expression will not do the correct validation because is not possible to do it with regular expressions.

I&#39;m trying to limit the sintax and visual complexity inherent to regular expressions, because in this case any will be correct.

What regexp can I use to do that?


  [1]: https://stackoverflow.com/questions/156430/regexp-recognition-of-email-address-hard/156441#156441

What is a good regular expression for catching typos in an email address?

I&#39;m working on an email validation regex in PHP and I need to know how long the TLD could possibly be and still be valid. I did a few searches but couldn&#39;t find much information on the topic. So how long can a TLD possibly be?

How long can a TLD possibly be?

I’m trying to make a html5 form that contains one email input, one check box input, and one submit input.
I&#39;m trying to use the pattern attribute for the email input but I don&#39;t know what to place in this attribute. I do know that I&#39;m supposed to use a regular expression that must match the JavaScript Pattern production but I don&#39;t know how to do this.

What I&#39;m trying to get this attribute to do is to check to make sure that the email contains one @ and at least one or more dot and if possible check to see if the address after the @ is a real address. If I can&#39;t do this through this attribute then I&#39;ll consider using JavaScript but for checking for one @ and one or more dot I do want to use the pattern attribute for sure.

The pattern attribute needs to check for:

1. Only one @
2. One or more dot
3. And if possible check to see if the address after the @ is a valid address

An alternative to this one is to use a JavaScript but for all the other conditions I do not want to use a JavaScript.



HTML5 Email input pattern attribute

&gt; **Possible Duplicate:**  
&gt; [What characters are allowed in email address?](https://stackoverflow.com/questions/2049502/what-characters-are-allowed-in-email-address)  

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I have an email address with an apostrophe in it and am wondering if that is valid?

Can there be an apostrophe in an email address?

I am trying to do an SQL query, but I need to check somehow if the value is an email address.
I need a way to check if `$user` is an email address, because I have user values such as this in my table.

    test
    test2
    test@example.com
    test2@example.com
    test392
    test@example.net

and so on...


**I need to make it so `$useremail` checks `$user` to find if it&#39;s an email address. So I can UPDATE the values, `WHERE user=test OR user=test@example.com`, etc.**

    $user = strtolower($olduser);
    $useremail = &quot;&quot;;

    mysql_query(&quot;UPDATE _$setprofile SET user=$sn, fc=$fc WHERE user=&#39;$user&#39; OR user=&#39;$useremail&quot;);



Check if a string is an email address in PHP

I&#39;m specifically looking for the minimum length of the prefix and domain. 

I&#39;ve seen conflicting information and nothing that looks authoritative. 

For reference, I found this page which claims that a one character email address is functional:

http://www.cjvandyk.com/blog/Lists/Posts/Post.aspx?ID=176

I tried validating email addresses at Gmail and they expect prefix greater than or equal to 6. 

These are obviously way off. 

My web framework expects prefix greater than or equal to 2.

All Email Validation Solutions on Gang of Coders

Total of 22 Email Validation Solutions