Technique for looking up stopwards from a table, instead of a static file in postgres

dynamic_stopwords.sql

CREATE TABLE IF NOT EXISTS stopwords (
  word VARCHAR(20) NOT NULL;
);

CREATE OR REPLACE FUNCTION remove_stopwords(string TEXT, OUT tsv TSVECTOR) AS
$$
BEGIN
  SELECT string_agg(words.*, ' ')::tsvector FROM 
  -- split tsvector into row for each word 
    regexp_split_to_table( 
      ( 
        SELECT to_tsvector('simple'::regconfig, string)::text), E'\\s+') words(word) 
        WHERE NOT EXISTS ( 
          SELECT 1 FROM stopwords sw WHERE sw.word = ( 
			-- break word out of 'hello':323 pattern 
			SELECT w[1] FROM regexp_matches(words.word, E'''(\\w+)'':') AS w 
		  ) 
	) INTO tsv;
END;
$$ LANGUAGE plpgsql;