Parking is available but costly. Public transport is highly recommended.
There is a car park 50 meter for the front of the hotel: Regency Square can park which offers secure parking 24 hours a day. Please check their website for price https://www.brighton-hove.gov.uk/content/parking-and-travel/parking/regency-square-car-park
There is also “pay and display” street parking in Regency Square.