replace the last "," with "and"

[archrid404]

How to replace the last "," with "and" 

Here my variable

test, test2, test3 it should be test, test2 and test3

[comment]

Let ( 
lastComma = Position (  text ; "," ; Length ( text ) ; - 1 ) 
;
If ( lastComma ; Replace ( text ; lastComma ; 1 ; " and" ) ; text )
)