Help me with this wordpress php function code

This function will perform get search term from url if 404 not found and redirect the search term to https://localhost/wordpress/?s= (my search term here), can help me edit the code abit?

function simple404_redirect() {
if(is_404()) {

$get_params = “”;
if ( preg_match(“@/?(\?.*)@”, $_SERVER[“REQUEST_URI”], $matches) ) {
$get_params = $matches[1];
}

// Extract search term from URL
$patterns_array = array();
if ( ( $patterns = trim( get_option(‘ignored_patterns’ ) ) ) ) {
$patterns_array = explode( ‘\n’, $patterns );
}

$patterns_array[] = “/(trackback|feed|(comment-)?page-?[0-9]…
$patterns_array[] = “\.(html|php)$”;
$patterns_array[] = “/?\?.*”;
$patterns_array = array_map(create_function(‘$a’, ‘$sep = (strpos($a, “@”) === false ? “@” : “%”); return $sep.trim($a).$sep.”i”;’), $patterns_array);

$search = preg_replace( $patterns_array, “”, urldecode( $_SERVER[“REQUEST_URI”] ) );
$search = basename(trim($search));
$search = str_replace(“_”, “-“, $search);
$search = trim(preg_replace( $patterns_array, “”, $search));
$search_words = trim(preg_replace( “@[_-]@”, ” “, $search));

wp_redirect( ‘https://localhost/wordpress/?s=%5Bhow do I put my search term here?] ‘, 301 );
}
}
add_action(‘template_redirect’, ‘simple404_redirect’);