Rails - Mar 2006 - validates_format_of before type_cast?

Often I need to do a one-off validation before Rails has had a chance to
convert. For example, a date. Is there a general mechanism to cause
validations to run on the raw input or do I have to resort to:

  private
  def validate
    unless attributes_before_type_cast[''date_of_loss''] =~
/^(\d+(-|\/)){2}\d{4}/
      errors.add(''date_of_loss'', ''use the form:
mm/dd/yyyy'')
    end
  end

Thanks

(BTW: I know there is a date validation plugin)
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