bufny

my own solution:

in the get_the_image_by_scan function, just after preg_match_all call:

$search_query =  get_search_query();
if (isset($matches) && !empty($search_query)) {
    $full_image_tags = $matches[0];
    $src_image_tags = $matches[1];
    foreach ($full_image_tags as $index => $full_image_tag) {
        if (stripos($full_image_tag, $search_query) !== FALSE) { // just return 1st match to the search_query
            return array('src' => $src_image_tags[$index]);
        }
    }
}