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To narrow down the search results, you can refine your query by specifying the fields to search for. The list of fields is presented above. For example:

You can search in several fields at the same time:

Logical operators

The default operator is AND.
Operator AND means that the document must match all elements in the group:

research development

Operator OR means that the document must match one of the values ​​in the group:

study OR development

Operator NOT excludes documents containing this element:

study NOT development

Search type

When writing a query, you can specify the method in which the phrase will be searched. Four methods are supported: search taking into account morphology, without morphology, prefix search, phrase search.
By default, the search is performed taking into account morphology.
To search without morphology, just put a “dollar” sign in front of the words in the phrase:

$ study $ development

To search for a prefix, you need to put an asterisk after the query:

study *

To search for a phrase, you need to enclose the query in double quotes:

" research and development "

Search by synonyms

To include synonyms of a word in the search results, you need to put a hash " # " before a word or before an expression in parentheses.
When applied to one word, up to three synonyms will be found for it.
When applied to a parenthetical expression, a synonym will be added to each word if one is found.
Not compatible with morphology-free search, prefix search, or phrase search.

# study

Grouping

In order to group search phrases you need to use brackets. This allows you to control the Boolean logic of the request.
For example, you need to make a request: find documents whose author is Ivanov or Petrov, and the title contains the words research or development:

Approximate word search

For approximate search you need to put a tilde " ~ " at the end of a word from a phrase. For example:

bromine ~

When searching, words such as "bromine", "rum", "industrial", etc. will be found.
You can additionally specify the maximum number of possible edits: 0, 1 or 2. For example:

bromine ~1

By default, 2 edits are allowed.

Proximity criterion

To search by proximity criterion, you need to put a tilde " ~ " at the end of the phrase. For example, to find documents with the words research and development within 2 words, use the following query:

" research development "~2

Relevance of expressions

To change the relevance of individual expressions in the search, use the " sign ^ " at the end of the expression, followed by the level of relevance of this expression in relation to the others.
The higher the level, the more relevant the expression is.
For example, in this expression, the word “research” is four times more relevant than the word “development”:

study ^4 development

By default, the level is 1. Valid values ​​are a positive real number.

Search within an interval

To indicate the interval in which the value of a field should be located, you should indicate the boundary values ​​in parentheses, separated by the operator TO.
Lexicographic sorting will be performed.

Such a query will return results with an author starting from Ivanov and ending with Petrov, but Ivanov and Petrov will not be included in the result.
To include a value in a range, use square brackets. To exclude a value, use curly braces.