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Stemming, Searching for EXACT Terms, and Excluding Keywords

Stemming and Searching for Exact Terms

DarkOwl Vision supports a process called stemming, which tries to reduce a word to an approximation of its stem or root form. Usually, terms are stemmed to plural/singular versions or different tenses. This means that searching will return matches on related forms of a word, unless you specify otherwise, for instance:

  • Hack may return Hacked, Hacker, Hacking, in addition to Hack

When you want to search for a specific term, including special characters and punctuation, use the exact: operator to prevent word stemming:

  • exact:hack – will return only documents containing the word hack

Excluding Items From a Search


Keywords can be excluded in multiple ways:

  • Using the 'NOT' Boolean operator
  • Prefacing the term with a hyphen
  • Prefacing the term with an exclamation mark

For example, the three searches below are equivalent and will find documents that contain 'DarkOwl' but not 'drugs'. Note that when excluding a keyword via hyphen or exclamation mark, it must be placed directly before the keyword with no space in between.

  • DarkOwl NOT drugs
  • DarkOwl -drugs
  • DarkOwl !drugs

You can also exclude values in other fields in the same way:

  • DarkOwl NOT domain:drugs.onion
  • DarkOwl -domain:drugs.onion
  • DarkOwl !domain:drugs.onion