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Tell me, please, how can I programmatically override the search query? For example: the user enters "Any word" in the search field, and the search is performed using the "Custom word". And as a result on the search page we get the goods found on the query "Custom word".

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Assuming you are using MySQL search provider.

Create a plugin and use the around Plugin Function technique.

class Match extends \Magento\Framework\Search\Adapter\Mysql\Query\Builder\Match {

In the aroundBuild method you can get the query value

$query->getValue()

And perform the queries you need there.

For much more information see these: https://webkul.com/blog/how-to-replace-magento2-default-search-engine/ http://www.ibnab.com/en/blog/magento-2/magento-2-get-one-search-result-by-sku

In Magento 2's default search provider, special symbols '-+~/\<>\'":*$#@()!,.?`=%&^' are replaced with an empty space ' '. ​This would lead to each space delimited search term being treated as "OR" conditions which I think is the thing you are trying to avoid. ​ If your looking to match exactly the ibnab in one of the attributes then the "get one search result by sku" may be a good starting place.

Do your query first for the exact match for a particular search query on a specific attribute id or column and if it has results set the match query to a SQL "in" condition on those id's?

$matchQuery = 'data_index IN('.implode(",", $result_id_array).')';

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