title: delete all cookies with specific string in name
body: <p>I want to delete some cookies in my application. They are all created in the application itself.</p>
  
  <p>In my case, all cookies with a special string in it should be destroyed.</p>
  
  <p>At the moment i have following code to unset a single cookie:</p>
  
  <pre><code>var expires = new Date();
  expires.setTime(expires.getTime() - 100);
  document.cookie = name + '=' + value + '; expires=' + expires.toUTCString() + '; path=' + path + '; domain=' + domain;
  </code></pre>
  
  <p>my cookie names are all like this: cookiename_identifier
  and all with cookiename_ should be deleted. </p>