anchor.diff:  ----
   
   *Syntax*
  -
   [source,txt]
   ----
   substring(<source>, <start_pos>[, <end_pos>])
  
positive.code: ----
  
  *Syntax*
  
  [source,txt]
  ----
  startsWith(<source>, <substring>)
  
negative.code: ----
  
  *Syntax*
  [source,txt]
  ----
  between(<source>, <left>, <right>[, <greedy_matching>, <case_sensitive>])
  