你需要做的是运行一个函数，当点击帖子上的“更新”按钮时会触发该函数。

我不能保证我隔离短代码的尝试是成功的，（我不太擅长这方面），但你肯定明白了！

add_action(\'save_post\', \'save_details\');
function save_details() {
    global $post;

    if(get_post_type($post->ID) == \'your_custom_post_type\') {
      if(stripos($post->post_content, \'[audio:http://\') !== false) { // if shortcode exists
        $content = $post->post_content;

        //first position of shortcode
        $p1 = stripos($content, \'[audio:http://\');

        // strip code from before the shortcode.
        $content = substr($content, $p1);

        //find when end of the shortcode starts
        $p2 = stripos($content, \'.mp3]\');
        $p2 = $p2 + 5;  // add five to get where it ends.

        //get full shortcode
        $content = substr($content, 0, $p2);

        // save shortcode to meta field
        update_post_meta($post->ID, \'custom_field_name\', $content);
    }
   }
}