Add method
   Use the Add method to insert text at a specific position in the filename.
 
  Use the Add method to insert text at a specific position in the filename.
  Add
  Specify the text you want added.
  Note You can use tags here to insert a metadata values.
  At index
  Use this to specify at what position in the filename the text should be added. If you want to add it to the beginning of the file, set the index to 1. If the index is longer than the filename, the text will be added to the end. If the value is non-numeric the index will be set to the index of the pattern supplied.
  Backwards
  Use this to make Position count from the end of the filename. If you check this, set Apply To to name and set Position to 1, the text will be added just before the last "." (the extension separator).
  Use regular expressions
  If checked the "At index" value can be expressed as a regular expressions pattern. The pattern will be translated to a numeric value for the position of the pattern found in the filename.
  Apply To
  Specifies if the change should be applied to the name, extension or both.