Regex pattern doesnt work
<p>I have an issue with <code>Validators.pattern</code> with a following regex:</p>

<pre><code>/^[_a-z0-9]+([_a-z0-9]+)*@[a-z0-9-]+([a-z0-9-]+)*([a-z]{2,4})$/
</code></pre>

<p>which should verify email address. You can check out the <a href="http://plnkr.co/edit/YNtG65JGnGYSLVzcgMTO?p=preview" rel="nofollow">plnkr</a>. If you delete <code>Validators.pattern(..)</code>, the form will work. </p>

<p>Any ideas?</p>