MATLAB: Help using fgetl??

bracketscommafgetlhardMATLABmatrixproblem

In the problem that i am currently on i have to use the data file mm.dat that looks like this
{33,2,11}
{45,9,3}
and use fgetl in a loop to read the data in. Then i am to create a matrix that stores just the numbers, and write the matrix to a new file. Assume that each line in the original file contains the same number of numbers.
i have this so far, but i cant figure out how to read only the numbers from the data and not the commas or the {}.
cat = fopen('mm.dat');
if cat == -1
    disp('file did not open')
else
      while feof(cat) == 0
          evrline = fgetl(cat)
          num = strtok(evrline)
          save probtwenonewfile num
      end
closeresult = fclose(cat);
end
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