isValidPartyCode(_:)
Checks whether a party code is in valid format.
Declaration
class func isValidPartyCode(_ partyCode: String) -> BoolMentioned in
Discussion
Party code should be two parts of strings with the same length (2-6) connected with a dash, and the code can be either pure digits (0-9), or both parts are uppercased characters from validPartyCodeAlphabet.