postgres=# SELECT to_tsquery('PostgreSQL | is | an | object | relational | database | management | system | based | on | POSTGRES | developed | at | the | University | of | California | at | Berkeley | Computer | Science | Department');
                                                                                                           to_tsquery

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 ( ( ( ( ( ( ( ( ( ( ( ( ( 'postgresql' | 'object' ) | 'relat' ) | 'databas' ) | 'manag' ) | 'system' ) | 'base' ) | 'postgr' ) | 'develop' ) | 'univers' ) | 'california' ) | 'berkeley' ) | 'comput' ) | 'scienc' ) | 'depart'
( 1  row)