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validate lib validate rules starts_with.ex

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lib/validate/rules/starts_with.ex

defmodule Validate.Rules.StartsWith do
  @moduledoc false

  import Validate.Validator

  def validate(%{value: value, arg: str}) do
    case String.starts_with?(value, str) do
      true -> success(value)
      false -> error("must start with #{str}")
    end
  end
end

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