static L<WebNode> indexedNodesAfterVariableSubstitution(S s) {
  L<WebNode> nodes = indexedNodesContainingDollarVars();
  new L<WebNode> l;
  for (WebNode node : nodes) {
    SS map = matchDollarVarsIC(web_text(node), s);
    if (map == null) continue;
    WebNode n = cloneWeb_handlingNode(node);
    web_replaceDollarVars(n.web, map);
    l.add(n);
  }
  ret l;
}