java regex to find unique digits

I have a string of some length (may vary) with digits, for example:

String strInput = "0002334556";

I need to get all unique digits from strInput and allocate them to a different string like this:

String uniques = "023456";

Currently stuck with what regex I should use to parse through strInput. Non-regex solutions are also welcome. This is not a real life task, but an academic one which favors regex.

>Solution :

Try this.

public static void main(String[] args) {
    String strInput = "00023345560303";

    String uniques ="(?<=.)"))




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