static SS ctxLoadRegexpMacros(S botID) {
  new SS out;
  File f = loadLibrary(botID);
  L<S> names = endingWithIC("/cm.pattern", listFilesInZip(f));
  for (S name : names) {
    L<S> lines = toLinesFullTrim(loadTextFileFromZip(f, name));
    for i, S s over lines: {
      int idx = s.indexOf("=");
      if (idx >= 0)
        out.put(trimSubstring(s, 0, idx), trimSubstring(s, idx+1));
    }
  }
  ret out;
}

Began life as a copy of #1008838