• Keyword matching

  • exact words

  • capitalizations

  • extended ASCII characters (é, ß, ø)

  • substrings

• Putting words together

  • AND (+), OR and NOT (-): Boolean matching

  • parentheses for faceted searching

  (red or scarlet or magenta) and (flower or bloom)

  • phrase searching "red rose"

  • proximity (near) searching

• Beyond exact matches

• stemming

• thesaurus

• fuzzy matching and soundex

• relevance feedback: "more like this"

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