static L<S> findSupportedQuestionsInFunctions_functionNames = litlist("match", "match3", "flexmatch");

static L<S> findSupportedQuestionsInFunctions_impl(S src, S... functionsToScan) {
  new TreeSet<S> questions;
  if (src != null)
    for (L<S> tok : tok_findMainFunctionsNamed(src, functionsToScan))
      for (int i = 1; i+4 < tok.size(); i += 2)
        if (findSupportedQuestionsInFunctions_functionNames.contains(tok.get(i)) && tok.get(i+2).equals("(")
        && isQuoted(tok.get(i+4)))
          questions.add(unquote(tok.get(i+4)));
  ret asList(questions);
}