I am looking to write a formula that counts the total number of marks of a question and sum them up together as a value in a column.
marks of a question may be identified by square brackets in a field (e.g.  means 1 mark,  means 2 marks)
A sample of the field looks like this:
"Study the diagram below.
a) Circle what happened to the amount of food in the bowl after a few days. 
b) Based on the diagram above, name one substance this animal needs so that it
remains alive. "
The total number of marks for this question would be 2 ( there are 2 s which sums up to 2)
I was thinking that I may count the string “” but the formula does not seem to have this function. I would need to find another way to work around it.
Any inputs/ ideas would be very much appreciated.
Thank you in advance!