1、简单检测身份证是否合法

-(BOOL)checkIDCard:(NSString *)idCardStr{    NSString *regex=@"^(\\d{15}$|^\\d{18}$|^\\d{17}(\\d|X|x))$";    NSPredicate *predicate=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];    if (![predicate evaluateWithObject:idCardStr]) {         return NO;    }    else{         return YES;    }}