Using $pos(text, string, N)

Currently, if N <= 0, $pos returns the number of occurrences of string in text. With other string identifiers such as $left(), $mid(), $right(), $*tok, etc a negetive N causes the identifier to work in reverse.

It would be handy if $pos() would support such reversed behavior aswell

Code
Example:
  $pos(abccba, a, -1) - returns 6

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