static S jreplaceStart(S s, S in, S out) {
  ret jreplaceStart(s, in, out, null);
}

static S jreplaceStart(S s, S in, S out, O condition) {
  L<S> tok = javaTok(s);
  jreplaceStart(tok, in, out, condition);
  ret join(tok);
}

// leaves tok properly tokenized
// returns true iff anything was replaced
static boolean jreplaceStart(L<S> tok, S in, S out) {
  ret jreplaceStart(tok, in, out, false, false, null);
}

static boolean jreplaceStart(L<S> tok, S in, S out, O condition) {
  ret jreplaceStart(tok, in, out, false, false, condition);
}

static boolean jreplaceStart(L<S> tok, S in, S out, boolean ignoreCase, boolean reTok, O condition) {
  L<S> tokin = javaTok(in);
  jfind_preprocess(tokin);

  int i = findCodeTokens(tok, 1, ignoreCase, toStringArray(codeTokensOnly(tokin)), condition); // TODO: opt
  if (i != 1) false;
  L<S> subList = tok.subList(i-1, i+l(tokin)-1); // N to N
  S expansion = jreplaceExpandRefs(out, subList);
  int end = i+l(tokin)-2;
  clearAllTokens(tok, i, end); // C to C
  tok.set(i, expansion);
  if (reTok)
    reTok(tok, i, end);
  true;
}

Began life as a copy of #1002133