title: Regexp match whole word not using \b
body: <p>I don't want to use <code>\b</code> because <code>str. abc</code> matches the <code>str</code></p>
  
  <p><strong>I want to match <code>str</code> when:</strong></p>
  
  <ul>
  <li>It is the sorounded in white spaces. Ex: "abc str xyz"</li>
  <li>It is at the begining/end of a sentence. Ex: "str abc" and "abc str"</li>
  </ul>