public static boolean regex(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "regex")) return false;
    if (!nextTokenIsSmart(b, DOLLAR_SLASHY_BEGIN, SLASHY_BEGIN)) return false;
    boolean r;
    Marker m = enter_section_(b, l, _NONE_, REGEX, "<regex>");
    r = slashy_string(b, l + 1);
    if (!r) r = dollar_slashy_string(b, l + 1);
    exit_section_(b, l, m, r, false, null);
    return r;
  }
public static boolean regex(PsiBuilder b, int l)