match strings with numbers and letter 6 length
<p>I'm trying to match all <code>SKU</code> codes from the following list</p>

<pre><code>Array([0] =&gt; Array([0] =&gt; CLASSI[1] =&gt; LEATHE[2] =&gt; **0MEFCQ**))

&lt;span&gt;VANS CLASSIC SLIP-ON CROC LEATHER **0MEFCQ** 36-40&lt;/span&gt;

([0] =&gt; Array([0] =&gt; TRAMPK[1] =&gt; **XH8GKA**))

&lt;span&gt;NOWE TRAMPKI VANS  SK8-HI SLIM ZIP **XH8GKA** 36-40&lt;/span&gt;

([0] =&gt; Array([0] =&gt; DAMSKI[1] =&gt; TRAMPK[2] =&gt; AUTHEN[3] =&gt; **EE3W00**))

&lt;span&gt;DAMSKIE TRAMPKI VANS AUTHENTIC **EE3W00** 35-41&lt;/s
</code></pre>

<p>I had tried with the following <code>REGEX</code> but it returns more strings. I want only <code>SKU</code> codes.</p>

<pre><code>preg_match_all('/[A-Z0-9]{1,2}\w{4}/', $title, $match);
</code></pre>