The aim is to find if there is an operator inside a MATLAB function call in a formula. The input is a string and the output is a boolean which is true if the string contains at least one operator in a function call, and false otherwise.
'min(var1+var2,2)' => true
'min(1,2)+min(3,4)' => false
'min(min(1,2),3))' => false
'min(min(1,var1+2),3))' => true
'4*var1' => false, there is no MATLAB function
You can assume that all opening brackets are closed.