WikiSysop at 18:15, 4 October 2012

2012-10-04T18:15:14Z

← Older revision		Revision as of 13:15, 4 October 2012
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	The following special operators and modifiers can be used when using the extended matching mode:		The following special operators and modifiers can be used when using the extended matching mode:

	operator OR:<br>		'''operator OR:'''<br>
	hello \| world<br>		hello \| world<br><br>
	operator NOT:<br>		'''operator NOT:'''<br>
	hello -world<br>		hello -world<br>
	hello !world<br>		hello !world<br><br>
	field search operator:<br>		'''field search operator:'''<br>
	@title hello @body world<br>		@title hello @body world<br><br>
	field position limit modifier (introduced in version 0.9.9-rc1):<br>		'''field position limit modifier (introduced in version 0.9.9-rc1):'''<br>
	@body[50] hello<br>		@body[50] hello<br><br>
	multiple-field search operator:<br>		'''multiple-field search operator:'''<br>
	@(title,body) hello world<br>		@(title,body) hello world<br><br>
	all-field search operator:<br>		'''all-field search operator:'''<br>
	@* hello<br>		@* hello<br><br>
	phrase search operator:<br>		'''phrase search operator:'''<br>
	"hello world"<br>		"hello world"<br><br>
	proximity search operator:<br>		'''proximity search operator:'''<br>
	"hello world"~10<br>		"hello world"~10<br><br>
	quorum matching operator:<br>		'''quorum matching operator:'''<br>
	"the world is a wonderful place"/3<br>		"the world is a wonderful place"/3<br><br>
	strict order operator (aka operator "before"):<br>		'''strict order operator (aka operator "before"):'''<br>
	aaa << bbb << ccc<br>		aaa << bbb << ccc<br><br>
	exact form modifier (introduced in version 0.9.9-rc1):<br>		'''exact form modifier (introduced in version 0.9.9-rc1):'''<br>
	raining =cats and =dogs<br>		raining =cats and =dogs<br><br>
	field-start and field-end modifier (introduced in version 0.9.9-rc2):<br>		'''field-start and field-end modifier (introduced in version 0.9.9-rc2):'''<br>
	^hello world$<br>		^hello world$<br><br>
	Here's an example query that uses some of these operators:<br>		'''Here's an example query that uses some of these operators:'''<br>

	Example 5.2. Extended matching mode: query example<br>		''Example 5.2. Extended matching mode: query example''<br>

	"hello world" @title "example program"~5 @body python -(php\|perl) @* code<br>		"hello world" @title "example program"~5 @body python -(php\|perl) @* code<br>

WikiSysop: Created page with "The following special operators and modifiers can be used when using the extended matching mode: operator OR:
hello | world
operator NOT:
hello -world
hello !..."

2012-10-04T17:59:12Z

Created page with "The following special operators and modifiers can be used when using the extended matching mode: operator OR: hello | world operator NOT: hello -world hello !..."

New page

The following special operators and modifiers can be used when using the extended matching mode:

operator OR: 
hello | world 
operator NOT: 
hello -world 
hello !world 
field search operator: 
@title hello @body world 
field position limit modifier (introduced in version 0.9.9-rc1): 
@body[50] hello 
multiple-field search operator: 
@(title,body) hello world 
all-field search operator: 
@* hello 
phrase search operator: 
"hello world" 
proximity search operator: 
"hello world"~10 
quorum matching operator: 
"the world is a wonderful place"/3 
strict order operator (aka operator "before"): 
aaa << bbb << ccc 
exact form modifier (introduced in version 0.9.9-rc1): 
raining =cats and =dogs 
field-start and field-end modifier (introduced in version 0.9.9-rc2): 
^hello world$ 
Here's an example query that uses some of these operators: 

Example 5.2. Extended matching mode: query example 

"hello world" @title "example program"~5 @body python -(php|perl) @* code 

The full meaning of this search is: 

Find the words 'hello' and 'world' adjacently in any field in a document; 
Additionally, the same document must also contain the words 'example' and 'program' in the title field, with up to, but not including, 10 words between the words in question; (E.g. "example PHP program" would be matched however "example script to introduce outside data into the correct context for your program" would not because two terms have 10 or more words between them)

Additionally, the same document must contain the word 'python' in the body field, but not contain either 'php' or 'perl';

Additionally, the same document must contain the word 'code' in any field.
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".

Field limit operator limits subsequent searching to a given field. Normally, query will fail with an error message if given field name does not exist in the searched index. However, that can be suppressed by specifying "@@relaxed" option at the very beginning of the query:

@@relaxed @nosuchfield my query
This can be helpful when searching through heterogeneous indexes with different schemas.

Field position limit, introduced in version 0.9.9-rc1, additionaly restricts the searching to first N position within given field (or fields). For example, "@body[50] hello" will not match the documents where the keyword 'hello' occurs at position 51 and below in the body.

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.

Quorum matching operator introduces a kind of fuzzy matching. It will only match those documents that pass a given threshold of given words. The example above ("the world is a wonderful place"/3) will match all documents that have at least 3 of the 6 specified words.

Strict order operator (aka operator "before"), introduced in version 0.9.9-rc2, will match the document only if its argument keywords occur in the document exactly in the query order. For instance, "black << cat" query (without quotes) will match the document "black and white cat" but not the "that cat was black" document. Order operator has the lowest priority. It can be applied both to just keywords and more complex expressions, ie. this is a valid query:

(bag of words) << "exact phrase" << red|green|blue
Exact form keyword modifier, introduced in version 0.9.9-rc1, will match the document only if the keyword occurred in exactly the specified form. The default behaviour is to match the document if the stemmed keyword matches. For instance, "runs" query will match both the document that contains "runs" and the document that contains "running", because both forms stem to just "run" - while "=runs" query will only match the first document. Exact form operator requires index_exact_words option to be enabled. This is a modifier that affects the keyword and thus can be used within operators such as phrase, proximity, and quorum operators.

Field-start and field-end keyword modifiers, introduced in version 0.9.9-rc2, will make the keyword match only if it occurred at the very start or the very end of a fulltext field, respectively. For instance, the query "^hello world$" (with quotes and thus combining phrase operator and start/end modifiers) will only match documents that contain at least one field that has exactly these two keywords.

Starting with 0.9.9-rc1, arbitrarily nested brackets and negations are allowed. However, the query must be possible to compute without involving an implicit list of all documents:

// correct query 
aaa -(bbb -(ccc ddd)) 

// queries that are non-computable 
-aaa 
aaa | -bbb

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WikiSysop at 18:15, 4 October 2012

WikiSysop: Created page with "The following special operators and modifiers can be used when using the extended matching mode: operator OR: hello | world operator NOT: hello -world hello !..."

WikiSysop: Created page with "The following special operators and modifiers can be used when using the extended matching mode: operator OR:
hello | world
operator NOT:
hello -world
hello !..."