The function ENCLOSEDAREAS calculates the enclosed areas – holes – in s string.

The calculation can be steerd with the parameters modeNumber and mode4.

• modusNumber:
  1: only numbers are valid
  0: all characters and digits are valid
• modus4:
  1: digit 4 is a closed area
  0: digit 4 is an open area

ENCLOSEDAREAS(string, modeNumber, mode4) => number