Oracle to PostgreSQL query conversion with string_to_array()

I have below query in Oracle:

SELECT to_number(a.v_VALUE), b.v_VALUE
       FROM TABLE(inv_fn_splitondelimiter('12;5;25;10',';')) a
       JOIN TABLE(inv_fn_splitondelimiter('10;20;;', ';')) b
         ON a.v_idx = b.v_idx

which give me result like:

I want to convert the query to Postgres. I have tried a query like:

SELECT UNNEST(String_To_Array('10;20;',';'))

I have also tried:

SELECT a,b
       FROM (select  UNNEST(String_To_Array('12;5;25;10;2',';'))) a
       LEFT JOIN (select  UNNEST(String_To_Array('12;5;25;10',';'))) b
         ON a = b

But didn't get a correct result.
I don't know how to write query that's fully equivalent to the Oracle version. Anyone?

Copyright Notice：Content Author:「Dhaval Patel」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/28494357/oracle-to-postgresql-query-conversion-with-string-to-array