Whenever you need to split a text into multiple records breaking by some delimeter, there are two common options that PostgreSQL provides. The first is
regpexp_split_to_table and then next popular is using the unnest function in combination with string_to_array.
Here is an example using regexp_split_to_table:
FROM regexp_split_to_table('john,smith,jones', ',') AS a;
You can achieve the same result by using the construct:
FROM unnest(string_to_array('john,smith,jones', ',')) AS a;
With short text you won't notice much perfomance difference. But what happens if we pass in a humungous text?