string[] scrapeTitles(M)(in M message)
{
    static re_url = ctRegex!(r"(https?|ftp)://[^\s/$.?#].[^\s]*", "i");
    static re_title = ctRegex!(r"<title.*?>(.*?)<", "si");
    static re_ws = ctRegex!(r"(\s{2,}|\n|\t)");

    return matchAll(message, re_url)
              .map!(      match => match.captures[0] )
              .map!(        url => get(url, limitRange("0-4096")).ifThrown([]) ) // just first 4k
              .map!(    content => matchFirst(cast(char[])content, re_title) )
              .array // cache to prevent multiple evaluations of preceding
              .filter!( capture => !capture.empty )
              .map!(    capture => capture[1].idup.entitiesToUni )
              .map!(  uni_title => uni_title.replaceAll(re_ws, " ") )
              .array
              .ifThrown(string[].init); // [] should work, possible bug
}