java - spliting with OR in regular expression -

I want to divide a math equation with regular expression, but I'm upset with a point.

We will see as an example: 3x ^ 3 + 2x ^ 2-6x * -3

After dividing by some regular expressions, I I want to get this result:

I hope the result:

  [0] 3x ^ 3 [1] + 2x ^ 2 [2] -6x [3 ] * -3  

I am trying with this RE: (? = (\\ * - | \\ - | \\ + | \\ * | \ \ /))

after equation.split ("(? = (\\ * - | \\ - | \\ + | \\ * | \\ /) ) "

The result is:

  [0] 3x ^ 3 [1] + 2x ^ 2 [2] -6x [3] * [4] -3  

I can not remove that part - \\ - - Because, if my string was: 3x ^ 3 + 2x ^ 2-6x-3 I will be expected:

  [0] 3x ^ 3 [1] + 2x ^ 2 [2] -6x [3] -3  

As you can see, my problem is that I write an RE which is * - < / Code> or only matches * or -

I think, (? >

You have to add a negative attitudes - you only want to split on hyphen if it's a * : < / P>

  equation.split ("(? = (? & Lt;! \\ *) - | \\ + | \\ * | /)")  

< / Div>