title: What does #(\w+)=([\'"])(.*)\\2#U mean?
body: <p>I am a noob to regex.</p>
  
  <p>I am hoping someone can explain what's going on in #(\w+)=([\'"])(.*)\2#U.</p>
  
  <pre><code>preg_match_all('#(\w+)=([\'"])(.*)\\2#U', $str, $matches);
  </code></pre>
  
  <p>Thanks in advance.</p>