title: Find all occurrences from a string - Presto
body: <p>I have the following as rows in HIVE (HDFS) and using Presto as the Query Engine. </p>
  
  <pre><code>1,@markbutcher72 @charlottegloyn Not what Belinda Carlisle thought. And yes, she was singing about Edgbaston.
  2,@tomkingham @markbutcher72 @charlottegloyn It's true the garden of Eden is currently very green...
  3,@MrRhysBenjamin @gasuperspark1 @markbutcher72 Actually it's Springfield Park, the (occasional) home of the might
  </code></pre>
  
  <p>The requirement is to do get the following through Presto Query. How can we get this please</p>
  
  <pre><code>1,markbutcher72
  1,charlottegloyn
  2,tomkingham
  2,markbutcher72
  2,charlottegloyn
  3,MrRhysBenjamin
  3,gasuperspark1 
  3,markbutcher72 
  </code></pre>