Single term query
This query specifies only one term for retrieving all of the
documents which contain that term, for example:
pro-face
AND query
This query specifies two or more terms for retrieving all of the
documents which contain both terms. Insert the
and operator between the terms, e.g.
pro-face and digital
You can omit the
and operator. Terms which are
separated by one ore more spaces are assumed to be an AND query.
OR query
This query specifies two or more terms for retrieving all
documents which contain any one term. Insert the
or operator between the terms,
e.g.
pro-face or plc
NOT query
This query specifies two or more terms for retrieving all of the
documents which contain a first term but do not contain the
following terms. Insert the
not
operator between the terms, for example:
pro-face not face
Grouping
You can group queries by surrounding them by
parentheses. The parentheses should be separated by one or
more spaces. e.g.
( pro-face or plc ) and digital not face
Phrase searching
You can search for a phrase that consists of two or more terms
by surrounding them with double quotation marks or braces such as
"..." and
{...}.
In Namazu, the precision of phrase searching is not 100 %,
so wrong results may occasionally occur. Example:
{digital Co.,}
Substring matching
The are three types of searching by substring matching.
- Prefix matching
inter* (terms which begin with inter)
- Inside matching
*text* (terms which contain text)
- Suffix matching
*net (terms which terminated
with net)
Regular expressions
You can use regular expressions for pattern matching. The
regular expressions must be surrounded by slashes like
/.../. Namazu uses
Ruby's regular
regular expressions engine. It generally offers a
Perl compatible flavor.
e.g.,
/pro(gram|blem)s?/
Notes
- In any queries, Namazu ignores case distinctions of
alphabet characters; i.e. Namazu does
case-insensitive pattern matching.
- Japanese phrases are automatically segmented into
morphemes and are handled as phrase searching. This process occasionally
causes invalid segmentation.
- Letters, numbers or parts of symbols (duplicated in
ASCII) 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 method of handling isn't complete,
you can also describe the term as TCP and IP instead of
TCP/IP, but it may cause noisy results.
- Substring matching and field-specified 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 like "..." or {...}.
