Ruby function to convert hex to RGB without using regex.

main.rb

class String
  def color
    if self.length != 6 && self.length != 8
      raise "Color must be in the format rrggbb or rrggbbaa. This is what you provided #{self}."
    end
    if self.length == 6
      working_number = 0xff000000 + self.to_i(16)
    else
      working_number = [*self[-2..-1], *self[0..5]].join.to_i(16)
    end

    components = working_number.to_s(16).each_char.each_slice(2).map do |parts|
      parts.join.to_i(16)
    end

    [components[1..-1], components[0]]
  end
end