Java; String replace (using regular expressions)?

As part of a project for school, I need to replace a string from the form: 5 * x^3 - 6 * x^1 + 1 to something like: 5x3 - 6x1 + 1 I believe this can be done with regular expressions, but I don't know how to do it yet. Can you lend me a hand? P.S. The actual assignment is to implement a Polynomial Processing Java application, and I'm using this to pass polynomial.toString() from the model to the view, and I want do display it using html tags in a pretty way.

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