anchor.diff:  
   *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.
  +*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]
   --------------------------------------------------
  
positive.code: --------------------------------------------------
  *Input*:
  
  <1> string expression
  
  *Output*: integer
  
  
negative.code: 
  *Output*: string
  
  *Description*: Returns a character string that is the result of concatenating `string_exp1` to `string_exp2`. `null` input strings are treated as empty strings.
  
  [source, sql]
  --------------------------------------------------
  