private static String badPositionIndexes(int start, int end, int size) {
    if (start < 0 || start > size) {
      return badPositionIndex(start, size, "start index");
    }
    if (end < 0 || end > size) {
      return badPositionIndex(end, size, "end index");
    }
    // end < start
    return lenientFormat("end index (%s) must not be less than start index (%s)", end, start);
  }

  }

  private String finishCollapseFrom(
      CharSequence sequence,
      int start,
      int end,
      char replacement,
      StringBuilder builder,
      boolean inMatchingGroup) {
    for (int i = start; i < end; i++) {
      char c = sequence.charAt(i);
      if (matches(c)) {
        if (!inMatchingGroup) {
          builder.append(replacement);

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