title: Python regular expressions
body: <p>Is there any regular expression to match this:</p>
  
  <ul>
  <li>a continuous string of characters or/and digits XOR</li>
  <li>a string of any characters between a pairquotation marks (" XOR ')including nested quotations </li>
  </ul>
  
  <p>?</p>
  
  <p>Examples:</p>
  
  <ul>
  <li>dgsdggsgggdggsggsd </li>
  <li>'dsfsasf .asgafaasfafw rq' </li>
  <li>"sadas fa fasfa "</li>
  </ul>