For one cell try this:
A1: Sugar
D1: Sugar Plums contain sugar
B1: =(LEN(D1)-LEN(SUBSTITUTE(UPPER(D1),UPPER(A1),"")))/LEN(A1)
returns 2
For multiple cells:
A1: Sugar
D1: Sugar Plums contain sugar
D2: Sugar and Spice
D3: Sugar Bears contain no sugar
D4: Candy Apples contain sugar
D5: Sugar
C1:
=SUMPRODUCT(LEN(D1

10)-LEN(SUBSTITUTE(UPPER(D1

10),UPPER(A1),"")))/LEN(A1)
returns 7
Does that help?
••••••••••
Regards,
Ron