title: Replace anything regex php
body: <p>i have this regex in php</p>
  
  <pre><code>$array_item_aux = str_replace('/.*PUBMED=/',"",$array_item);
  </code></pre>
  
  <p>it shoul be replacing this text 
  (-|ENSR00001252129|RegulatoryFeature|regulatory_region_variant|-|-|-|-|-|PUBMED=21499247</p>
  
  <p>with this</p>
  
  <pre><code>21499247
  </code></pre>
  
  <p>what i'm doing wrong</p>