title: Finding placeholders and put then in an array
body: <p>In my string I have place holders like: ##NEWSLETTER## , ##FOOTER# ##GOOGLEANALYTICS## etc.</p>
  
  <p>Each of those placeholders is delimited by: ##</p>
  
  <p>I want to find each of thos placeholders and put them in an array.</p>
  
  <p>The tricky part is that what's inside the ## delimiters can be anything.</p>