gistfile1.rb

class CodedException < Exception
  attr_accessor :code

  def initialize(code, msg='')
    super msg 
    @code = code
  end 
end

class Range
  def ===(obj)
    if obj.kind_of? CodedException
      self === obj.code
    else
      self.begin <= obj and (self.exclude_end? ? obj < self.end : obj <= self.end)
    end 
  end 
end

begin
  raise CodedException.new(250, 'message')
rescue 0..99
  puts :e0 
rescue 100..199
  puts :e100
rescue 200..299
  puts :e200
end

#=> e200