Search Instructions

NOTE: for basic search, multiple words should be separated by AND or OR, or enclosed in double-quotes.

Instructions for advanced search:

  • Wildcards (prefix-only) must be enclosed in double-quotes: "pram*"
  • When multiple words are used with wildcards, the wildcard applies to all words in the phrase. For example, "mult cond*" will match "multiple conditions".
  • Phrase searches must be in double-quotes: "ankylosing spondylitis"
  • For nearness-related searches, use the NEAR keyword (or the tilda character [~], which is a synonym): neuralgia NEAR neurontin
  • Multiple nearness searches can be chained together: arthritis ~ stiffness ~ inflammation
  • Boolean operators are supported (with synonyms): AND (&), AND NOT (&!), OR (|)
  • NOT is applied before AND. AND cannot be used before the first keyword. Parentheses can be used for grouping.
  • Searches are not case sensitive.
  • Noise words such as "a", "the", "and" are not searchable.
  • Punctuation is ignored.
  • Inflectional variations are supported: FORMSOF(INFLECTIONAL,keyword). For example FORMSOF(INFLECTIONAL,swell) AND abdomen will find pages containing both "swollen" and "abdomen".
  • The NEAR operator cannot be used with FORMSOF.
  • Initial search results are sorted by the quality of the resulting match (rank).
  • Result ranking can be influenced, using weight factors that are between 0.0 and 1.0: ISABOUT(ankylosing weight(0.8), inflammation weight(0.2))