(IOS)判断输入昵称

+(BOOL)validateNickname:(NSString*)nickname

{

    NSString *nicknameRegex = @"^[\u4E00-\u9FA5\uf900-\ufa2d·s•]{2,20}$";

    NSPredicate*passWordPredicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",nicknameRegex];

    return[passWordPredicateevaluateWithObject:nickname];

}