coryd.dev/queries/functions/slugify.psql

CREATE OR REPLACE FUNCTION slugify(input TEXT)
RETURNS TEXT AS $$
BEGIN
  RETURN lower(
    regexp_replace(
      unaccent(
        regexp_replace(input, '[^\w\s-]', '', 'g')
      ),
      '\s+', '-', 'g'
    )
  );
END;
$$ LANGUAGE plpgsql IMMUTABLE;