Create hash from string

I have hash like this input: { "token" => "09d43089eef82b25eac082b50567512a566e4d2b", "quote{insurance_type_id" => 1, "quote{period_id" => "1", "quote{period_id" => 1, "quote{items[0{vehicle_id" => "203972", "quote{items[0{vehicle_manufacture_year" => 2012, "quote{items[0{drivers[0{driver_type_id" => 1, "quote{items[{drivers[1{driver_type_id" => "1" } and i want to out put like this output: quote: { items: [ { drivers: [ {driver_type_id: 1}, {driver_type_id: 2} ] } ] } please help me how can i do that.