title: Regular expression pattern to match URL with or without http://www
body: <p>I'm not very good at regular expressions at all.</p>
  <p>I've been using a lot of framework code to date, but I'm unable to find one that is able to match a URL like <code>http://www.example.com/etcetc</code>, but it is also is able to catch something like <code>www.example.com/etcetc</code> and <code>example.com/etcetc</code>.</p>