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In addition to basic match, phrase, and term queries, additional advanced query types are exposed as query builder functions. Query builder functions use the @@@ operator. @@@ takes a column on the left-hand side and a query builder function on the right-hand side. It means “find all rows where the column matches the given query.” For example: 
SELECT description, rating, category
FROM mock_items
WHERE description @@@ pdb.regex('key.*rd');
Expected Response
       description        | rating |  category
--------------------------+--------+-------------
 Ergonomic metal keyboard |      4 | Electronics
 Plastic Keyboard         |      4 | Electronics
(2 rows)
This uses the regex builder function to match all rows where description matches the regex expression key.*rd.