SearchDatabase.php

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<?php
class SearchDatabase extends SearchEngine {
    protected $db;

    public function __construct( DatabaseBase $db = null ) {
        if ( $db ) {
            $this->db = $db;
        } else {
            $this->db = wfGetDB( DB_SLAVE );
        }
    }

    protected function filter( $text ) {
        $lc = $this->legalSearchChars();
        return trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
    }
}