how to use substring and trim string

Hi,
I have a string Like
      
String SizeandPrice= "Large[+3],Medium,Small[-2],X-small[-1]"; now i want to split and add in two columns in array list or data set
Like
Size                -    Price
Large             -    +3
Medium         -     0
Small             -     -2
X-Small          -     -1
any script or suggestions please.
Appropriate for quick and best response.