Substitutes (examples)

1. "abcdefghijklmnopqrstuvwxyz" Substitute(klm, KLM)
   
   results: "abcdefghijKLMnopqrstuvwxyz
   
   
2. 23.5g substitutes(g, gram)
   
   results in "23.5 grams "; the object on the stack top is transformed into a string before the replace operation
   
   
3. "abcdefghijklmnopqrstuvwxyz" "klm" "*" Substitute(STACK, STACK)
   
   results: "abcdefghij*nopqrstuvwxyz"; each of the two operands can be passed by stack
   
   
4. "abcdefghijklmnopqrstuvwxyz" "klm" "" Substitute(STACK, STACK)
   
   results: "abcdefghijnopqrstuvwxyz";" klm" is replaced by the empty string, i.e. "klm" disappears
   
   
5. "abcdefghijklmnopqrstuvwxyz" "" "***" Substitute(STACK, STACK)
   
   results: "abcdefghijklmnopqrstuvwxyz"; replace "nothing" with something: the original string remains unchanged
   
   
6. "fair is foul and foul is fair..." Substitutes(fair, FAIR)
   
   results: "FAIR is foul and foul is FAIR... "; because multiple substitutions are possible