title: PHP RegEx for removing a Blockquote
body: <p>I'm using a preg replace to remove a twitter embeded tweet from a string something that looks like this </p>
  
  <pre><code>&lt;blockquote class="twitter-tweet" lang="en"&gt;&lt;p&gt;Frank Lampard challenges for the ball... &lt;a href="https://twitter.com/search?q=%23CFC&amp;amp;src=hash"&gt;#CFC&lt;/a&gt; &lt;a href="http://t.co/CALSJZx2Fu"&gt;pic.twitter.com/CALSJZx2Fu&lt;/a&gt;&lt;/p&gt;&amp;mdash; Chelsea FC (@chelseafc) &lt;a href="https://twitter.com/chelseafc/statuses/384596498110877696"&gt;September 30, 2013&lt;/a&gt;&lt;/blockquote&gt;
  &lt;script async src="//platform.twitter.com/widgets.js" charset="utf-8"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>Its coming up with an error </p>
  
  <pre><code>Warning: preg_replace() [function.preg-replace]: Unknown modifier 'b' in /inc/functions_custom.php on line 261
  </code></pre>
  
  <p>Here is my PHP regex - not sure whats wrong.</p>
  
  <pre><code>$string = preg_replace('/([\s\S]*)(&lt;blockquote&gt;)([\s\S]*)(&lt;/blockquote&gt;)([\s\S]*)/', "", $string); 
  </code></pre>