Java Regex - Included array

I'm stuck with a javax regex.

I have this kind of string :

 " [[[10,10],[20,20],[30,30]], [[11,11],[21,21],[31,31]]] "

The goal is to split this string into different levels of arrays. If I'm not clear this is what I should get after the treatment.

1. Split the string into the first level:

   " [[[10,10],[20,20],[30,30]], [[11,11],[21,21],[31,31]]] "
   
   

   Give

      "  [[10,10],[20,20],[30,30]], [[11,11],[21,21],[31,31]] "
   
   

2. Split each result of 1. into the second level:

     " [[10,10],[20,20],[30,30]], [[11,11],[21,21],[31,31]]  "
   
   

   Give

     "  [[10,10],[20,20],[30,30]] "
       and
     "  [[11,11],[21,21],[31,31]] "
   
   

3. Split each result of 2. into the third level

     " [[10,10],[20,20],[30,30]]  "
   
   

   Give

     "  [10,10] "
       and
     "  [20,20] "
       and 
     "  [30,30] "
   
   

   And

     " [[11,11],[21,21],[31,31]]  "
   
   

   Give

     "  [11,11] "
       and
     "  [21,21] "
       and 
     "  [31,31] "
   
   

So if you have the good regex pattern to do that, it will be nice.

Thanks in advance, PKB