add <br/> after third space of a string
<p>I am trying to add <code>&lt;br /&gt;</code> after the third space of a string, for example:</p>

<p><code>'an apple a day keeps the doctor away'</code></p>

<p>I want the string like:</p>

<pre><code>'an apple a 
day keeps the doctor away'
</code></pre>

<p>Any help?</p>
