function flushRules(){
    global $wp_rewrite;
    $wp_rewrite->flush_rules();
}
add_filter('init','flushRules');

function custom_rewrite_basic() {
global $post;

$args = array(
    'date_query' => array(
        array(
            'year' => date( 'Y' ),
            'week' => date( 'W' ),
        ),
    ),
);
        $getOldUrl = new WP_Query( $args );

// The Loop
if ( $getOldUrl->have_posts() ) {

    while ( $getOldUrl->have_posts() ) {
        $getOldUrl->the_post();
         $terms = wp_get_post_terms( get_the_ID(), 'oldurl' );
    if ( ! empty( $terms ) && ! is_wp_error( $terms ) )

        {
            $trimmedTermName = ltrim($terms[0]->name, '/');
            $toRedirect = "index.php?page_id=" . get_the_ID();
         add_rewrite_rule( $trimmedTermName, $toRedirect, 'top');

    }