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The simple tokenizer splits on any non-alphanumeric character (e.g. whitespace, punctuation, symbols). All characters are lowercased by default. 
CREATE INDEX search_idx ON mock_items
USING bm25 (id, (description::pdb.simple))
WITH (key_field='id');
To get a feel for this tokenizer, run the following command and replace the text with your own: 
SELECT 'Tokenize me!'::pdb.simple::text[];
Expected Response
     text
---------------
 {tokenize,me}
(1 row)