title: PHP regexp values
body: <p>My Regexp:</p>
  
  <pre><code>/^(\p{L}+)(?:\.(\p{L}+))*$/
  </code></pre>
  
  <p>and subject:</p>
  
  <pre><code>app.config.db
  </code></pre>
  
  <p>It returns matches <code>app</code> and <code>db</code>. Why this script omit <code>config</code>?</p>