import text file from different location, multiple delimiter

I need to import .txt files from different folders, and then read multiple delimiters.

I tried textscan with fullfile, but the variable is empty.

file = fopen(fullfile(folderPath{k},FileNames{i}),'r')        
      temp = textscan(file,'%u64','MultipleDelimsAsOne',1,'Delimiter',{',''['']'})
      fclose(file);

Result is empty file- it's not reading the data. wrong format spec? I tried different ones. Data is just integers.

file =

     3

temp = 

    [0x1 uint64]

Data is in following format in .txt files:

[[ 1 , 2], [3 , 4] ....]]

Answer 1

[Philip Hoskinson]

I got a step further - I needed to include '_' (space) delimiter in

 'Delimiter',{',' '[' ']' '_' })

Now I have trouble summing matrices:

Error using  + 
Integers can only be combined with integers of the same
class, or scalar doubles.