py-ard considers 'DRB3*NNNN' v2 typing

`DRB3*NNNN` or `DRB3:XXXX` passes the v2 test and fails reduction.

```
% pyard --gl "DRB3*NNNN" -r lgx                                                                              
...
    if isinstance(flags, RegexFlag):
RecursionError: maximum recursion depth exceeded while calling a Python object
```