create schema v;
create table v.roon(
  id serial primary key,
  content text
);
with tokenizers as (
  select
    x
  from
    jsonb_array_elements(
      (select pgroonga_command('tokenizer_list'))::jsonb
    ) x(val)
  limit
    1
  offset
    1 -- first record is unrelated and not stable
)
select
  t.x::jsonb ->> 'name'
from
  jsonb_array_elements((select * from tokenizers)) t(x)
order by
  t.x::jsonb ->> 'name';
                  ?column?                   
---------------------------------------------
 TokenBigram
 TokenBigramIgnoreBlank
 TokenBigramIgnoreBlankSplitSymbol
 TokenBigramIgnoreBlankSplitSymbolAlpha
 TokenBigramIgnoreBlankSplitSymbolAlphaDigit
 TokenBigramSplitSymbol
 TokenBigramSplitSymbolAlpha
 TokenBigramSplitSymbolAlphaDigit
 TokenDelimit
 TokenDelimitNull
 TokenDocumentVectorBM25
 TokenDocumentVectorTFIDF
 TokenMecab
 TokenNgram
 TokenPattern
 TokenRegexp
 TokenTable
 TokenTrigram
 TokenUnigram
(19 rows)

insert into v.roon (content)
values
  ('Hello World'),
  ('PostgreSQL with PGroonga is a thing'),
  ('This is a full-text search test'),
  ('PGroonga supports various languages');
-- Create default index
create index pgroonga_index on v.roon using pgroonga (content);
-- Create mecab tokenizer index since we had a bug with this one once
create index pgroonga_index_mecab on v.roon using pgroonga (content) with (tokenizer='TokenMecab');
-- Run some queries to test the index
select * from v.roon where content &@~ 'Hello';
 id |   content   
----+-------------
  1 | Hello World
(1 row)

select * from v.roon where content &@~ 'powerful';
 id | content 
----+---------
(0 rows)

select * from v.roon where content &@~ 'supports';
 id |               content               
----+-------------------------------------
  4 | PGroonga supports various languages
(1 row)

drop schema v cascade;
NOTICE:  drop cascades to table v.roon