Oracle SQL, getting string value between 2 points

I need to select a string value between two dots. (dots include)

Given abc.musadeneme.dce I need .musadeneme.

I need your help, thanks.

You can use SUBSTR and INSTR (which is much faster than regular expressions):

SELECT SUBSTR(
         value,
         INSTR(value, '.', 1, 1),
         INSTR(value, '.', 1, 2) + 1 - INSTR(value, '.', 1, 1)
       ) AS match
FROM   table_name

Which, for the sample data:

CREATE TABLE table_name (value) AS
SELECT 'abc.musadeneme.dce' FROM DUAL;

Outputs:

fiddle