Untitled

SELECT 
    CASE
        WHEN INSTR(your_column, '.') > 0 THEN
            -- If a period '.' exists, extract the two digits before the second to last occurrence of '_'
            SUBSTR(
                your_column,
                INSTR(your_column, '_', -1, 2) - 2,
                2
            )
        ELSE
            -- If no period '.' exists, take the two digits before the second to last occurrence of '_'
            SUBSTR(
                your_column,
                INSTR(your_column, '_', -1, 2) - 2,
                2
            )
    END AS result
FROM your_table;