sS dynamize(S text) {
  Matcher m = Pattern.compile("#([0-9]+)").matcher(htmlencode(text).replace("&#", "&~~~"));
  new StringBuffer buf;
  while (m.find()) {
    S id = m.group(1);
    mreplace(m, buf, ahref(snippetLink(id), "#" + id));
  }
  m.appendTail(buf);
  ret str(buf).replace("&~~~", "&#");
}