title: PHP capture word that contains special char from string using RegEx
body: <p>I have special words in a string that i would like to capture based on the prefix.<br>
  <strong>Example</strong>  <code>Special words such as ^to_this should be caught</code>.<br>
  I would need the word <code>this</code> because of the special prefix <code>^to_</code>.<br>
  Here is my attempt but it is not working</p>
  
  <pre><code>preg_match('/\b(\w*^to_\w*)\b/', $str, $specialWordArr); 
  </code></pre>
  
  <p>but this returns an empty array</p>