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    <p>Nope, that regex is not that fit for the purpose. <a href="http://www.regular-expressions.info/email.html" rel="nofollow noreferrer">Have a look at this</a> instead (though I can't guarantee it's validity).<br> Also, regarding the script itself, why are you not checking like this:</p> <pre><code>function checkEmailValidity(e) { return e.match("some validating regex"); } </code></pre> <p>It seems like a faster, more consise, and more readable solution.</p> <p><strong>EDIT:</strong><br> It's worth noting, that it's almost impossible to write a regex that can detect any valid email address. Therefore, you might be better off with trying to make some validation algorithm, instead of a regex, as valid email adresses may be very, very complex.</p> <p>Consider this code:</p> <pre><code>function validateEmail(email) { if (typeof email != "string") return false; email = email.split("@"); email[1] = email[1].split("."); if ( email.length !== 2 || email[1].length &lt; 2 || !email[1].hasValues(String) ) return false; return true; } // Checks whether each key in an array has a value, and (optionally) if they match a given contructor (object type). // I.e.: myArray.hasValues(String) // checks whether all elements in myArray has a value, a nonempty string. Array.prototype.hasValues = function(assumedConstructor) { for (var i = 0; i &lt; this.length; i++) { if (!this[i]) return false; if (assumedConstructor &amp;&amp; this[i].constructor != assumedConstructor) return false; } return true; }; </code></pre> <p>It works this way:</p> <ol> <li>First checking if the string contains one <code>@</code>, and only one</li> <li>Checks that the part after the <code>@</code> has at least one <code>.</code></li> <li>Checks that there is some characters between each of the possible <code>.</code>'s.</li> </ol> <p>It will still be easy to forge a fake email address, but this way we ensure that it's at least <em>somehow</em> properly formatted. The only gotcha that I can think of, is <code>@</code>'s inside comments, which should be perfectly legal according to the RFC's, but this code will treat it as an error.<br> Normal internet users, which have normal email adresses, will not fail this. So how much it actually matters is up to you to decide ;) </p> <p>The best solution, if one is available, is to put the address into some built-in method, that somehow checks for validity by trying to use the email address.</p>
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    1. COThe regex in the referenced article is wrong - and the author simply claims his definition of e-mail addresses is fine - only it is defined by RFC, and he is wrong.
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    2. COI'm very sorry for the reference. I normally don't do regexes, so I wouldn't know.
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