Trigger To Parse A String From Insert Statement

I have two tables:

tb_news--
-story_id
-productlist

tb_lookup--
-story_id
-product

when an insert command is run on tb_news, productlist field is
populated with a value such as 'abc, def, de'

when this happens, i need tb_lookup to be populated with seperate
records for each product in productlist and the story_id from tb_news.

Example:
INSERT INTO tb_news (story_id, product_list)
VALUES (12345, 'abc, def, de')

Results:
tb_news--
12345, 'abc, def, de'

tb_lookup--
12345, 'abc'
12345, 'def'
12345, 'de'


Ideally, I would like this to use recursion and give me tha ability to
change the delimiter at any time (might not always be a comma). some
products may have a period in them. number of products is unknown and
might be 0 (field may be empty or NULL).