Scala: How to mask the first N characters of a string -

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given string represents credit card number...

val creditcardno = "1111222233334444"

... how mask first 12 characters *?

val maskedcreditcardno = "************4444"

replace digit symbols unless 4 characters remain:

creditcardno.replaceall("\\d(?=\\d{4})", "*")

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