strip h tag content form excerpts

function wp_strip_header_tags( $excerpt='' ) {

    $raw_excerpt = $excerpt;
    if ( '' == $excerpt ) {
        $excerpt = get_the_content('');
        $excerpt = strip_shortcodes( $excerpt );
        $excerpt = apply_filters('the_content', $excerpt);
        $excerpt = str_replace(']]>', ']]>', $excerpt);
}

$regex = '#(<h([1-6])[^>]*>)\s?(.*)?\s?(<\/h\2>)#';
        $excerpt = preg_replace($regex,'', $excerpt);

        $excerpt_length = apply_filters('excerpt_length', 55);
        $excerpt_more = apply_filters('excerpt_more', ' ' . '[...]');
        $excerpt = wp_trim_words( $excerpt, $excerpt_length, $excerpt_more );

return apply_filters('wp_trim_excerpt', preg_replace($regex,'', $excerpt), $raw_excerpt);
}
add_filter( 'get_the_excerpt', 'wp_strip_header_tags', 9);