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Search Features — Relevancy-Ranking
dtSearch can sort and instantly re-sort searches by relevancy with respect to number of hits, file name, file date, etc.
Natural language algorithms provide automatic term weighting, following a "plain English" or unstructured indexed search request.
 
Automatic term weighting is based on the frequency and density of hits in your files.
For example, in the search request get me Sam's memo on the 1999 CorpX takeover, if 1999 appeared in 3,000 files, and Sam appeared in only two files, then Sam would get a much higher relevancy rating, taking you straight to the most "relevant" files.
A positional scoring option works with dtSearch's natural language relevancy ranking to rank documents more highly when hits are near the top of a file, or otherwise clustered in a file.
dtSearch also includes variable term weighting options for both indexed and unindexed searches:
 
Positive term weighting can place extra emphasis on one or more words: soup:8 or recipe:3
Negative term weighting can assign negative emphasis to one or more words: red or green or yellow:-7
Variable term weighting can also apply to fields:  (description:5 contains (apple and pear)) or (author:2 contains smith)
 
The dtSearch product line can instantly search terabytes of text across a desktop, network, Internet or Intranet site.
dtSearch products also serve as tools for publishing, with instant text searching, large document collections to Web sites or CD/DVDs.
over two dozen indexed, unindexed, fielded and full-text search options
highlights hits in HTML, XML and PDF, while displaying embedded links, formatting and images
converts other file types — word processor, database, spreadsheet, email and full-text of email attachments, ZIP, Unicode, etc. — to HTML for display with highlighted hits
built-in Spider adds a third-party or other Web site (public, secure content, password accessible, etc.) to your searchable database
Spider supports Web-based content (HTML, PDF, XML, etc.) as well as dynamically-generated content (ASP.NET, MS CMS, SharePoint, etc.)
General supported file types
SQL and similar data sources

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