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class SomeController
  def asin_params
    # comma or semicolon, optionally surrounded by whitespace
    # or
    # two or more whitespace characters
    # or
    # any number of newline characters
    String(params[:asins])
      .split(/ \s*[,;]\s* | \s{2,} | [\r\n]+/x)
      .select { |item| item.length > 8 }
      .map(&:upcase)
  end
end