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for <<c <- str>>,
c in ?a..?z or c in ?A..?Z,
into: "",
do: <<c>>
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for <<c <- str>>,
c in ?a..?z or c in ?A..?Z,
into: "",
do: <<c>>
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String.replace(str, ~r([^a-zA-Z]+), "")
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[^[:alpha:]]
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