（IOS）身份证号验证

- (BOOL)validateIdentityCard {

    BOOLflag;

    if(self.length <=0) {

        flag =NO;

        returnflag;

    }

    NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";

    NSPredicate*identityCardPredicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@",regex2];

    return[identityCardPredicateevaluateWithObject:self];

}