The text search engine allows queries to be formed from arbitrary Boolean expressions containing the keywords AND, OR, NOT, and grouped with parentheses.
For example:
procedure codes finds documents containing 'procedure' and 'codes' procedure OR codes finds documents containing 'procedure' or 'codes' procedure AND codes finds documents containing both 'procedure' and 'codes' procedure AND NOT codes finds documents containing 'procedure' but not 'codes' (procedure AND NOT codes) AND physician finds documents containing 'physician', plus 'procedure' but not 'codes' auth* finds documents containing words starting with 'auth' (i.e., authorizing, authorized, authorize)
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