How to create new column based on values after "/" in other column in Oracle?

I have table with "col1" in Oracle:

col1
------
email1.com/GGR2
pokmail.com/AA
rrajd.com.nl/RRe2

I need to create "col2" with values after "/". So as a result I need something like below:

col1              | col2
--------------------------
email1.com/GGR2   |GGR2
pokmail.com/AA    |AA
rrajd.com.nl/RRe2 |RRe2

How can I do that in Oracle?

>Solution :

Regular expressions or substr + instr:

SQL> with test (col1) as
  2    (select 'email1.com/GGR2' from dual union all
  3     select 'pokmail.com/AA'  from dual union all
  4     select 'rrajd.com.nl/RRe2' from dual
  5    )
  6  select col1,
  7         regexp_substr(col1, '\w+$') col2_first,
  8         --
  9         substr(col1, instr(col1, '/') + 1) col2_second
 10  from test;

COL1              COL2_FIRST        COL2_SECOND
----------------- ----------------- -----------------
email1.com/GGR2   GGR2              GGR2
pokmail.com/AA    AA                AA
rrajd.com.nl/RRe2 RRe2              RRe2

SQL>