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    <p>Validating emails is <em>hard</em>. The fully correct regex is a true monstrosity that you can see (if you dare) at <a href="http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html" rel="nofollow noreferrer">http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html</a> which <em>probably</em> isn't what you want.</p> <p>Instead, you have a few options. Use a regex that matches 99% of emails, do it server side with an email validation library, or implement a finite state machine to parse it correctly. The state machine is probably too bulky (although allows neat stuff like suggestions for possible typos) and doing it all server side -- which you better be doing anyway (what if someone has JavaScript disabled?) -- loses the benefits of as-you-type checking.</p> <p>That leaves a simpler regex that doesn't match all legal emails, but matches enough that the chances of someone registering with one that it doesn't are really slim. The regex from <a href="https://stackoverflow.com/questions/46155/validate-email-address-in-javascript">Validate email address in JavaScript?</a> should do the trick pretty well:</p> <pre><code>/^(([^&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,}))$/ </code></pre> <p>Also, you made a small typo:</p> <pre><code>else if(!email.test('#email')) { $('#emailErrorMsg').text("OK"); } </code></pre> <p>is testing against the string '#email' -- not the element with the ID 'email'. Change that to:</p> <pre><code>else if(!email.test($('#email').val())) { $('#emailErrorMsg').text("OK"); } </code></pre>
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    1. COYes, this worked thankyou! Turns out I hadn't assigned it to the jquery!
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    2. COIf it worked, please mark it as the answer (click the check mark to the left).
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