Order by on datafile name.

Hi All,
I am using 11GR2 and looking to find out a way , where in I able to extract the data files name in such a manner , where it lists data file in order of mount points. say data1 first and then so on..
Snippet from my data files output.
/db/ptmtrain/data1/system01.dbf
/db/ptmtrain/data2/sysaux01.dbf
/db/ptmtrain/data1/undotbs01.dbf
/db/ptmtrain/data3/tools01.dbf
/db/ptmtrain/data24/users01.dbf
/db/ptmtrain/data25/users02.dbf
/db/ptmtrain/data26/users03.dbf
/db/ptmtrain/data2/rbs01.dbf
/db/ptmtrain/data3/rbs02.dbf
/db/ptmtrain/data2/rbs03.dbf
/db/ptmtrain/data23/sans01.dbf
should be something like
/db/ptmtrain/data1/system01.dbf
/db/ptmtrain/data1/undotbs01.dbf
/db/ptmtrain/data2/sysaux01.dbf
/db/ptmtrain/data2/rbs03.dbf
/db/ptmtrain/data2/rbs01.dbf
/db/ptmtrain/data3/tools01.dbf
/db/ptmtrain/data3/rbs02.dbf
/db/ptmtrain/data23/sans01.dbf
/db/ptmtrain/data24/users01.dbf
/db/ptmtrain/data25/users02.dbf
/db/ptmtrain/data26/users03.dbf
Regards

As already explained just as suggested: thanks bencol (I'm on Company time right now, answers are provided instead of coffee breaks )
with
data_files as
(select '/db/ptmtrain/data1/system01.dbf' file_name from dual union all
select '/db/ptmtrain/data2/sysaux01.dbf' from dual union all
select '/db/ptmtrain/data1/undotbs01.dbf' from dual union all
select '/db/ptmtrain/data3/tools01.dbf' from dual union all
select '/db/ptmtrain/data24/users01.dbf' from dual union all
select '/db/ptmtrain/data25/users02.dbf' from dual union all
select '/db/ptmtrain/data26/users03.dbf' from dual union all
select '/db/ptmtrain/data2/rbs01.dbf' from dual union all
select '/db/ptmtrain/data3/rbs02.dbf' from dual union all
select '/db/ptmtrain/data2/rbs03.dbf' from dual union all
select '/db/ptmtrain/data23/sans01.dbf' from dual
select file_name,instr(file_name,'/',-1) one,substr(file_name,18,instr(file_name,'/',-1) - 18) two
from data_files
order by to_number(substr(file_name,18,instr(file_name,'/',-1) - 18))
FILE_NAME
ONE
TWO
/db/ptmtrain/data1/system01.dbf
19
1
/db/ptmtrain/data1/undotbs01.dbf
19
1
/db/ptmtrain/data2/sysaux01.dbf
19
2
/db/ptmtrain/data2/rbs03.dbf
19
2
/db/ptmtrain/data2/rbs01.dbf
19
2
/db/ptmtrain/data3/tools01.dbf
19
3
/db/ptmtrain/data3/rbs02.dbf
19
3
/db/ptmtrain/data23/sans01.dbf
20
23
/db/ptmtrain/data24/users01.dbf
20
24
/db/ptmtrain/data25/users02.dbf
20
25
/db/ptmtrain/data26/users03.dbf
20
26
Regards
Etbin

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