title: Pentaho Data integration: "group by" with Concatenate strings separated by ";" instead of ","
body: <p>I have to concatenate strings from different fields. The output should be all strings in on field seperated by semi-colons.</p>
  
  <p>The "Group by" Transformation step does everything i need to do, but I can only separate them with " " or with tabs or with ",". 
  The strings i need to concat contain "," themselves so i cant use "," to separate them?</p>