SearchDatabase.php

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<?php
use Wikimedia\Rdbms\IDatabase;
 
class SearchDatabase extends SearchEngine {
    protected $db;
 
    public function __construct( IDatabase $db = null ) {
        if ( $db ) {
            $this->db = $db;
        } else {
            $this->db = wfGetDB( DB_REPLICA );
        }
    }
 
    protected function filter( $text ) {
        // List of chars allowed in the search query.
        // This must include chars used in the search syntax.
        // Usually " (phrase) or * (wildcards) if supported by the engine
        $lc = $this->legalSearchChars( self::CHARS_ALL );
        return trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
    }
}