Ngindex Search Syntax
The systax of the search depends on what mode you set. The mode can be set using the "Search Type" dropdown. The following types of search are supported:
- Any Of Words: matches any of the query words (default mode)
- All Of Words: matches all query words
- Exact Phrase: matches query as a phrase, requiring perfect match (all words in the order specified)
- Extended: matches query as an expression in Sphinx internal query language (see below for more info)
Extended query syntax
Extended queries allow the following special operators to be used:
* operator OR:
hello | world
* operator NOT:
hello -world
hello !world
* phrase search operator:
"hello world"
* proximity search operator:
"hello world"~10
Here's an example query which uses all these operators:
Example: Extended query example
"hello world" "example program"~5 python -(php|perl)
There always is implicit AND operator, so "hello world" means that both
"hello" and "world" must be present in matching document.
OR operator precedence is higher than AND, so "looking for cat | dog |
mouse" means "looking for ( cat | dog | mouse )" and not "(looking for cat)
| dog | mouse".
Proximity distance is specified in words, adjusted for word count, and
applies to all words within quotes. For instance, "cat dog mouse"~5 query
means that there must be less than 8-word span which contains all 3 words,
ie. "CAT aaa bbb ccc DOG eee fff MOUSE" document will not match this query,
because this span is exactly 8 words long.
Nested brackets, as in queries like
aaa | ( bbb ccc | ( ddd eee ) )
are not allowed yet, but this will be fixed.
Negation (ie. operator NOT) is only allowed on top level and not within
brackets (ie. groups). This isn't going to change, because supporting
nested negations would make phrase ranking implementation way too
complicated.
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