static S jreplace_first(S s, S in, S out) {

  ret jreplace_first(s, in, out, null);

}

static S jreplace_first(S s, S in, S out, O condition) {

  L<S> tok = javaTok(s);

  ret jreplace_first(tok, in, out, false, false, condition) ? join(tok) : s;

}

// leaves tok properly tokenized

// returns true iff anything was replaced

static boolean jreplace_first(L<S> tok, S in, S out) {

  ret jreplace_first(tok, in, out, false, true, null);

}

static boolean jreplace_first(L<S> tok, S in, S out, O condition) {

  ret jreplace_first(tok, in, out, false, true, condition);

}

static boolean jreplace_first(L<S> tok, S in, S out, boolean ignoreCase, boolean reTok, O condition) {

  L<S> tokin = javaTok(in);

  jfind_preprocess(tokin);

  boolean anyChange = false;

  int i = 1;

  if ((i = findCodeTokens(tok, i, ignoreCase, toStringArray(codeTokensOnly(tokin)), condition)) >= 0) {

    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);

    anyChange = true;

  }

  ret anyChange;

}

static bool jreplace_first_debug;