title: how to use tortoisehg's search tools?
body: <p>I want to search for a specific phrase (ie "comma_delimited") in a specific file (ie "index.php") in a specific branch (ie "ABC-123"). The reason for this is, that text is no longer in the file, and I want to see at which commit it was taken out, without looking at every revision of this file on this branch.</p>
  
  <p>Is there a way to do this in tortoisehg? I see there is a Search button which brings up a search panel where you can enter patterns, but I have no clue how to use it (and don't know how to write patterns), and after googling for some time, found no useful info on it.</p>
  
  <p>Thanks</p>