let caps = RE.captures(message.content.trim());
    let m = match caps.filter(|m| m.len() >= 3) {
        Some(m) => m,
        None => {
            if let Ok(cm) = http_client
                .create_message(message.channel_id)
                .reply(message.id)
                .content("Invalid submission")
            {
                let _ = cm.await;
            }
            return;
        }
    };