Permutation of Zeros

Hi Experts !

How do you select a string field for those only
with a permutation of Zeros?
You want to ignore (not select) if there are other values:

For example:

    field01
    -------
1.  0000
2.  00100
3.  0000000
4.  0
5.  00012s0
7.  000
8.  00
9.  10
10. 00000e1
11. 4c00000

select  * from tbl01
where ???

so the return values should be:

1.  0000
3.  0000000
4.  0
7.  000
8.  00

Thanks in advance for your help.