Regular Expression for matching a numeric sequence?

Question

Does anyone know of a regular expression for matching on a sequence of four digits? I need a match on ascending (1234), descending (4321), or the same (1111). This would b

Answer 1

public static boolean isDigitAscendingSequence(String ssn) {
    return "0123456789".contains(ssn);
}

The same logic with descending sequences