How to split a string of only ten characters e.g.“12345*45688” into an array

I'm making a simple calculator where you type values into an edit box. I need to split the string into a number of arrays depending on how many *+-/ there are in the sum for instance

I have 22+22*22-22/22 I want to break that into five different arrays because there are five different groups of numbers. Then later I am going to add array1 to array two multiply that by array3 and subtract that by array4 and divide that by array 5.