anchor.diff:  
   *Output*: boolean value
   
  -*Description*: Returns `true` if the source expression starts with the specified pattern, `false` otherwise. The matching is case sensitive.
  -If either parameters is `null`, the function returns `null`.
  +*Description*: Returns `true` if the source expression starts with the specified
  +pattern, `false` otherwise. The matching is case sensitive.
   
   [source, sql]
   --------------------------------------------------
  
positive.code: --------------------------------------------------
  *Input*:
  
  <1> string expression
  <2> string expression
  <3> integer expression; optional
  
  *Output*: integer
  
  *Description*: Returns the starting position of the first occurrence of `pattern` within `source`. The optional `start` specifies the character position to start the search with. The first character position in `source` is indicated by the value 1. Not specifying `start` or specifying it as `null`, any negative value, 0 or 1, starts the search at the first character position. If `pattern` is not found within `source`, the value 0 is returned.
  
  [source, sql]
  --------------------------------------------------
  
negative.code: --------------------------------------------------
  *Input*:
  
  <1> integer expression between `0` and `255`. If `null`, negative, or greater
  than `255`, the function returns `null`.
  
  *Output*: string
  
  *Description*: Returns the character that has the ASCII code value specified by the numeric input.
  
  [source, sql]
  --------------------------------------------------
  