The DCOUNT() function counts the number of field elements in a string that are separated by a specified delimiter.
expression1 evaluates to a string in which fields are to be counted.
The delimiter string may consist of more than 1 character.
If expression1 is a NULL string, then the function will return a value of 0.
The delimiter string may consist of any character, including system delimiters such as field marks or value marks.
Also see COUNT.
A = "A:B:C:D"
will display the value 4.