> ## Documentation Index
> Fetch the complete documentation index at: https://labs.laer.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Document search

Epiq AI has incorporated versatile search capabilities that streamline the document review process. It supports both Boolean search, natural language search, as well as structured search filters.

## Boolean search

For Boolean search queries, Epiq AI supports two types of query syntax:

* #### [Lucene](/product-guides/search/document-search/lucene)
* #### [dtSearch](/product-guides/search/document-search/dtsearch)

<Frame>
  <img src="https://mintcdn.com/epiqai/EvD16a-ShRZsx03D/images/boolean_search.png?fit=max&auto=format&n=EvD16a-ShRZsx03D&q=85&s=0f12e1bc3b9aae253cd8f29ca1e241b8" alt="" width="2864" height="1590" data-path="images/boolean_search.png" />
</Frame>

## Natural language search

Any query that is longer than 5 tokens\* and does not contain any Boolean operators will be treated as a natural language query.

<Frame>
  <img src="https://mintcdn.com/epiqai/5-Xpsc0dxL4Alr7A/images/language_search.png?fit=max&auto=format&n=5-Xpsc0dxL4Alr7A&q=85&s=bfeda5a93fcb0f0513ad8e30bcb5e2c5" alt="" width="2872" height="1596" data-path="images/language_search.png" />
</Frame>

\*1 token \~= 4 chars in English, 1 token \~= ¾ words

## Search Filters

<Frame>
  <img src="https://mintcdn.com/epiqai/PTrKqfq7PLU1AcXh/images/search_filters.png?fit=max&auto=format&n=PTrKqfq7PLU1AcXh&q=85&s=1b05f536f8be3f6f71e13dd38bff8577" alt="" width="2856" height="946" data-path="images/search_filters.png" />
</Frame>