SQL Puzzle - Sorting Versions stored in Varchar2 Column

I am a regular follower of ASKTOM and OTN. I found a interesting question regarding Sorting the Versions which I thought could be a very good candidate to be on this Puzzle series. I am hoping that you will also like it and will enjoy solving it.

Lets first create the table and data for this.

SQL> create table versions
  2  (
  3    version varchar2(30)
  4  );
Table created.

SQL> insert into versions values ('1.1');
1 row created.

SQL> insert into versions values ('1.1.1');
1 row created.

SQL> insert into versions values ('1.2.10');
1 row created.

SQL> insert into versions values ('1');
1 row created.

SQL> insert into versions values ('1.10.1');
1 row created.

SQL> insert into versions values ('1.1.2');
1 row created.

SQL> insert into versions values ('2.1');
1 row created.

SQL> insert into versions values ('2');
1 row created.

SQL> insert into versions values ('1.10.2');
1 row created.

SQL> insert into versions values ('1.2');
1 row created.

SQL> insert into versions values ('1.2.4');
1 row created.

SQL> insert into versions values ('1.2.5');
1 row created.

SQL> commit;
Commit complete.

Here goes the problem Statement:
I want to sort data of versions table by individual number separated by Dot of version column. below is the result I need:

1 
1.1 
1.1.1 
1.1.2 
1.2 
1.2.4 
1.2.5 
1.2.10 
1.10.1 
1.10.2 
2
2.1

Here is the solution which I have created

  SELECT version
    FROM versions
ORDER BY TO_NUMBER (REGEXP_SUBSTR (version, '\d+')),
         TO_NUMBER (REGEXP_SUBSTR (version,'\d+',1,2)) NULLS FIRST,
         TO_NUMBER (REGEXP_SUBSTR (version,'\d+',1,3)) NULLS FIRST;

You can put your answers on the comment box. Enjoy solving it :)

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