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Query

Single term query

This query specifies only one term for retrieving all documents which contain the term. For example,

namazu

AND query

This query specifies two or more terms, and retrieves all indexed documents that contain both terms. You can insert the and operator between the terms. For example,

Linux and Netscape

Because the and operator is assumed between terms separated by one or more spaces, it can be omitted.

OR query

This query specifies two or more terms, and retrieves all indexed documents which contain either one of the terms. You insert the or operator between the terms in your query. For example,

Linux or FreeBSD

NOT query

This query specifies two or more terms, and retrieves all indexed documents which contain the first term but do not contain the following terms. You insert the not operator between the terms in the NOT query. For example,

Linux not UNIX

Grouping

You can group queries by surrounding them with parentheses. The parentheses should be separated from the terms by one or more spaces. For example,

( Linux or FreeBSD ) and Netscape not Windows

Phrase searching

You can search for a phrase composed of two or more terms by surrounding the terms with double quotes, "...", or with braces, {...}. For example,

{GNU Emacs}

In Namazu, the accuracy of phrase searching is not 100%, so erroneous results may be returned.

Substring matching

The are three types of substring match searches.

Prefix matching

inter* (terms which begin with inter)

Inside matching

*text* (terms which contain text)

Suffix matching

*net (terms which end with net)

Regular expressions

You can use regular expressions for pattern matching. The regular expressions must be surrounded by slashes: /.../. Namazu uses Ruby's regular expressions engine. It offers Perl compatible flavor. For example,

/pro(gram|blem)s?/

Field-specific searching

You can limit your search to specific fields such as Subject:, From:, Message-Id:. This type of query is especially convenient for Mail/News documents. For example,

• +subject:Linux
  (Retrieve all documents that contain Linux in a Subject: field)
• +subject:"GNU Emacs"
  (Retrieve all documents that contain GNU Emacs in a Subject: field)
• +from:foo@bar.jp
  (Retrieve all documents that contain foo@bar.jp in a From: field)
• +message-id:<199801240555.OAA18737@foo.bar.jp>
  (Retrieve a document that contains the specified Message-Id:)

Notes

• In all queries, Namazu ignores whether or not alphabetic characters are capital or lower-case. In other words, Namazu does only case-insensitive pattern matching.
• Japanese phrases are segmented into morphemes automatically, and are then handled as phrase searches. This occasionally causes invalid segmentation.
• Alphabetic, numeric or symbolic (duplicated in ASCII) characters which are defined in JIS X 0208 (Japanese Industrial Standards) are handled as ASCII characters.
• Namazu can handle a term which contains symbols like TCP/IP. Since this handling isn't complete, you can use TCP and IP instead of TCP/IP, but that may cause noisy results.
• Substring matching and field-specific searching takes more time than other methods.
• If you want to use and, or or not simply as terms, you can surround them with double quotes, "...", or braces, {...}.

This search system is powered by Namazu