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Query |
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Single term query
The query specifies only one term for retrieving all documents which contain the term. e.g.,
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AND query
The query specifies two or more terms for retrieving all documents which contain both terms. You can insert the and operator between the terms. e.g.,
[examples] japan and tokyo
You can ommit the and operator. Terms which is separated by one ore more spaces is assumed to be AND query.
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OR query
The query specifies two or more terms for retrieving all documents which contain either term. You can insert the or operator between the terms. e.g.,
[examples] japan or tokyo
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NOT query
The query specifies two or more terms for retrieving all documents which contain a first term but does't contain the following terms. You can insert the not operator between the terms to do NOT query. e.g.,
[examples] japan not tokyo
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Grouping
You can group queries by surrounding them by parentheses. The parentheses should be separated by one or more spaces. e.g.,
[examples] ( japan or tokyo ) and osaka not kyoto
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Phrase searching
You can search for a phrase which consists of two or more terms by surrounding
them with double quotes like "..." or with braces like {...}.
e.g.,
[examples] {Bill Clinton}
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Substring matching
The are three types of substring matching searching.
Prefix matching
e.g., inter* (terms which begin with inter)
Inside matching
e.g., *text* (terms which contain text)
Suffix matching
e.g., *net (terms which terminated with net)
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| Notes |
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In any queries, our service ignores case distinctions of alphabet characters.
In other words, it does case-insensitive pattern matching in any time. |
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Japanese phrases are forced to be segmented into morphemes automatically and
are handled them as phrase searching. This processing causes invalid segmentation
occasionally. |
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Our service can handle a term which contains symbols like TCP/IP. Since this
handling isn't complete, you can describe TCP and IP instead of TCP/IP, but it
may cause noisy results. |
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Alphabet, numbers or a part of symbols (duplicated in ASCII) characters which
defined in JIS X 0208 (Japanese Industrial Standards) are handled as ASCII characters. |
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Substring matching takes more time than other methods. |
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If you want to use and, or or not
simply as terms, you can surround them respectively with double quotes like "..."
or braces like {...}. |
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