address-and-box.rb

STREET  = /(?<street>[^\d\,]{2,})/i
NUMBER  = /(?<box>[\d]{2,5})/i

addresses = [
  "BRAY PARK 4500",
  "BRAY PARK, 4500",
  "4500 BRAY PARK",
  "4500, BRAY PARK"
]

addresses.each do |address|
  number  = address.match(NUMBER)[:number].trim
  street  = address.match(STREET)[:street].trim
  p "number: #{number} street: #{street}"
end

# number: 4500 street: BRAY PARK
# number: 4500 street: BRAY PARK
# number: 4500 street: BRAY PARK
# number: 4500 street: BRAY PARK