The text search engine allows queries to be formed from
arbitrary Boolean expressions containing the keywords AND, OR, and NOT, and grouped with
parentheses. For example:
information retrieval -finds documents
containing 'information' or 'retrieval'
information or retrieval - same as above
information and retrieval - finds documents containing both 'information'
and 'retrieval'
information not retrieval - finds documents containing 'information' but
not 'retrieval'
(information not retrieval) and WAIS - finds documents containing 'WAIS',
plus 'information' but not 'retrieval'
web* - finds documents containing words starting with 'web'
