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'
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