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Confluence uses the Apache Lucene search engine library

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. Lucene performs tokenization and stemming. For information about the effects, refer to the Confluence issue Provide ability to override Lucene tokenisation and stemming and search for exact text
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Searching for a string surrounded by quotes produces results with an exact match except for strings with stop words such as "the." Stop words are ignored.

As part of its tokenization process, Lucene strips out punctuation from the search string, although Confluence search now preserves  _ (underline) characters. Refer to the Confluence issue Allow search for words and phrases with non-letter symbols: plus (+), minus (-), period (.), dollar sign ($), asterisk (*), etc

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For detailed information about Confluence search refer to the following pages provided by Atlassian:

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The following tips are from support people who have helped users to understand Confluence search results.

Searching with quotes, for example searching for the string "Book One", does not look for an exact match like most search engines do. Rather, it looks for "Book AND One" and would return all matches where "One" is the first word after "Book" other than words considered to be stop words (a, the, an, etc.) This is explained in the following support request: http://jira.atlassian.com/browse/CONF-7148

It's not possible for Confluence search to return hits for "the best," as an example--with or without quotes, "the" is ignored.

On the back end Confluence is using a search tokenizer called Lucene

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Tip

You can insert a Confluence search box on a wiki page. Refer to the Confluence Gadgets demonstration (Confluence QuickNav).