SET client_min_messages = warning;
CREATE EXTENSION IF NOT EXISTS icu_parser CASCADE;
RESET client_min_messages;
SELECT alias, description FROM ts_token_type('icu') ORDER BY tokid;
 alias  |          description           
--------+--------------------------------
 word   | Word, letters
 blank  | Space, punctuation and symbols
 number | Number
 kana   | Kana word
 ideo   | Ideographic word
(5 rows)

SELECT alias, token, lexemes FROM ts_debug('icu_simple', '東京駅前ラーメン店 ร้านกาแฟ Café McDonald''s 7-Eleven 3.5km');
 alias  |   token    |   lexemes    
--------+------------+--------------
 ideo   | 東京       | {東京}
 ideo   | 駅前       | {駅前}
 ideo   | ラーメン   | {ラーメン}
 ideo   | 店         | {店}
 blank  |            | 
 word   | ร้าน        | {ร้าน}
 word   | กาแฟ       | {กาแฟ}
 blank  |            | 
 word   | Café       | {café}
 blank  |            | 
 word   | McDonald's | {mcdonald's}
 blank  |            | 
 number | 7          | {7}
 blank  | -          | 
 word   | Eleven     | {eleven}
 blank  |            | 
 word   | 3.5km      | {3.5km}
(17 rows)

SELECT to_tsvector('icu_simple', 'Starbucks Coffee 星巴克咖啡 สตาร์บัคส์');
                               to_tsvector                               
-------------------------------------------------------------------------
 'coffee':2 'starbucks':1 'ตาร์บัคส์':8 'ส':7 '克':5 '咖啡':6 '巴':4 '星':3
(1 row)

SELECT to_tsvector('icu_simple', '東京駅前ラーメン店') @@ plainto_tsquery('icu_simple', 'ラーメン');
 ?column? 
----------
 t
(1 row)

SELECT to_tsvector('icu_simple', 'ร้านกาแฟสด') @@ plainto_tsquery('icu_simple', 'กาแฟ');
 ?column? 
----------
 t
(1 row)

SELECT to_tsvector('icu_simple', 'CAFÉ Ünïcode') @@ phraseto_tsquery('icu_simple', 'café ünïcode');
 ?column? 
----------
 t
(1 row)

SELECT to_tsvector('icu_simple', '');
 to_tsvector 
-------------
 
(1 row)

SELECT to_tsvector('icu_simple', '   !!! ');
 to_tsvector 
-------------
 
(1 row)

SELECT ts_headline('icu_simple', 'The best ラーメン in Tokyo', plainto_tsquery('icu_simple', 'ラーメン'));
            ts_headline            
-----------------------------------
 The best <b>ラーメン</b> in Tokyo
(1 row)

CREATE TABLE icu_names (name text);
INSERT INTO icu_names VALUES ('東京駅前ラーメン店'), ('Blue Bottle Coffee'), (NULL);
CREATE INDEX ON icu_names USING gin (to_tsvector('icu_simple', name));
SET enable_seqscan = off;
SELECT name FROM icu_names WHERE to_tsvector('icu_simple', name) @@ plainto_tsquery('icu_simple', 'ラーメン');
        name        
--------------------
 東京駅前ラーメン店
(1 row)

RESET enable_seqscan;
DROP TABLE icu_names;