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scrub 

        # String.scrub

(from ruby core)
---
    str.scrub -> new_str
    str.scrub(repl) -> new_str
    str.scrub{|bytes|} -> new_str

---

If the string is invalid byte sequence then replace invalid bytes with
given replacement character, else returns self. If block is given,
replace invalid bytes with returned value of the block.

    "abc\u3042\x81".scrub #=> "abc\u3042\uFFFD"
    "abc\u3042\x81".scrub("*") #=> "abc\u3042*"
    "abc\u3042\xE3\x80".scrub{|bytes| '<'+bytes.unpack1('H*')+'>' } #=> "abc\u3042<e380>"

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