svoid gazelle_parseInstruction(RuleEngine2.SimplifyWithRule r) {
  new Matches m;
  S s = r.text;
  if "simplify with *"
    ret with r._function = $1;
  else if "simplify with * on tree" {
    r.callOnTree = true;
    ret with r._function = $1;
  } else if "drop after word *" {
    fS word = $1;
    ret with r._function = func(S s) { tok_dropStartingWithWord(word, s) };
  } else if "group words *" {
    fS words = $1;
    ret with r._function = func(S s) { tok_groupPhrase(s, words) };
  } else if "split with *" {
    r.isSplitRule = true;
    ret with r._function = $1;
  }
}