Program: 35867
Project: 35867
Buggy source:
@Override protected ParsedResult extract(String text,Date refDate,Matcher matcher,ChronoOptions options){
  Calendar calendar=Calendar.getInstance();
  calendar.setTime(refDate);
  if (matcher.group(2) == null && matcher.group(11) == null && matcher.group(6) == null)   return null;
  ParsedResult result=new ParsedResult();
  result.start.imply(Components.DayOfMonth,calendar.get(Calendar.DAY_OF_MONTH));
  result.start.imply(Components.Month,calendar.get(Calendar.MONTH) + 1);
  result.start.imply(Components.Year,calendar.get(Calendar.YEAR));
  int hour=0;
  int minute=0;
  int second=0;
  int meridiem=-1;
  if (matcher.group(3).toLowerCase().equals("String_Node_Str")) {
    meridiem=1;
    hour=12;
  }
 else   if (matcher.group(3).toLowerCase().equals("String_Node_Str")) {
    meridiem=0;
    hour=0;
  }
 else {
    hour=Integer.parseInt(matcher.group(3));
  }
  if (matcher.group(6) != null) {
    minute=Integer.parseInt(matcher.group(6));
    if (minute >= 60)     return null;
  }
 else   if (hour > 100) {
    minute=hour % 100;
    hour=hour / 100;
  }
  if (matcher.group(9) != null) {
    second=Integer.parseInt(matcher.group(9));
    if (second >= 60)     return result;
  }
  if (matcher.group(11) != null) {
    if (hour > 12)     return null;
    if (matcher.group(11).toLowerCase().equals("String_Node_Str")) {
      meridiem=0;
      if (hour == 12)       hour=0;
    }
    if (matcher.group(11).toLowerCase().equals("String_Node_Str")) {
      meridiem=1;
      if (hour != 12)       hour+=12;
    }
  }
  if (hour > 24)   return null;
  if (hour >= 12)   meridiem=1;
  result.index=matcher.start() + matcher.group(1).length();
  result.text=matcher.group().substring(matcher.group(1).length(),matcher.group().length() - matcher.group(12).length());
  if (!result.start.isCertain(Components.Hour)) {
    result.start.assign(Components.Hour,hour);
    result.start.assign(Components.Minute,minute);
    result.start.assign(Components.Second,second);
    if (meridiem >= 0)     result.start.assign(Components.Meridiem,meridiem);
  }
  Pattern secondPattern=Pattern.compile(SECOND_REG_PATTERN,Pattern.CASE_INSENSITIVE);
  matcher=secondPattern.matcher(text);
  if (!matcher.find(result.index + result.text.length())) {
    return result;
  }
  meridiem=-1;
  minute=0;
  second=0;
  hour=Integer.parseInt(matcher.group(2));
  if (matcher.group(5) != null) {
    minute=Integer.parseInt(matcher.group(5));
    if (minute >= 60)     return result;
  }
 else   if (hour > 100) {
    if (matcher.group(10) == null)     return result;
    minute=hour % 100;
    hour=hour / 100;
  }
  if (matcher.group(8) != null) {
    second=Integer.parseInt(matcher.group(8));
    if (second >= 60)     return result;
  }
  if (matcher.group(10) != null) {
    if (hour > 12)     return result;
    if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
      if (hour == 12) {
        hour=0;
        if (result.end == null) {
          result.end=new ParsedDateComponent(result.start);
        }
        result.end.assign(Components.DayOfMonth,result.end.get(Components.DayOfMonth) + 1);
      }
    }
    if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
      if (hour != 12)       hour+=12;
    }
    if (!result.start.isCertain(Components.Meridiem)) {
      if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
        result.start.imply(Components.Meridiem,0);
        if (result.start.get(Components.Hour) == 12)         result.start.assign(Components.Hour,0);
      }
      if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
        result.start.imply(Components.Meridiem,1);
        if (result.start.get(Components.Hour) != 12)         result.start.assign(Components.Hour,result.start.get(Components.Hour) + 12);
      }
    }
  }
  if (hour >= 12)   meridiem=1;
  result.text=result.text + matcher.group();
  if (result.end == null) {
    result.end=new ParsedDateComponent(result.start);
  }
  result.end.assign(Components.Hour,hour);
  result.end.assign(Components.Minute,minute);
  result.end.assign(Components.Second,second);
  if (meridiem >= 0)   result.end.assign(Components.Meridiem,meridiem);
  return result;
}

Fixed version (ground truth):
@Override protected ParsedResult extract(String text,Date refDate,Matcher matcher,ChronoOptions options){
  Calendar calendar=Calendar.getInstance();
  calendar.setTime(refDate);
  if (matcher.group(2) == null && matcher.group(11) == null && matcher.group(6) == null)   return null;
  ParsedResult result=new ParsedResult();
  result.start.imply(Components.DayOfMonth,calendar.get(Calendar.DAY_OF_MONTH));
  result.start.imply(Components.Month,calendar.get(Calendar.MONTH) + 1);
  result.start.imply(Components.Year,calendar.get(Calendar.YEAR));
  int hour=0;
  int minute=0;
  int second=0;
  int meridiem=-1;
  if (matcher.group(3).toLowerCase().equals("String_Node_Str")) {
    meridiem=1;
    hour=12;
  }
 else   if (matcher.group(3).toLowerCase().equals("String_Node_Str")) {
    meridiem=0;
    hour=0;
  }
 else {
    hour=Integer.parseInt(matcher.group(3));
  }
  if (matcher.group(6) != null) {
    minute=Integer.parseInt(matcher.group(6));
    if (minute >= 60)     return null;
  }
 else   if (hour > 100) {
    minute=hour % 100;
    hour=hour / 100;
  }
  if (matcher.group(9) != null) {
    second=Integer.parseInt(matcher.group(9));
    if (second >= 60)     return null;
  }
  if (matcher.group(11) != null) {
    if (hour > 12)     return null;
    if (matcher.group(11).toLowerCase().equals("String_Node_Str")) {
      meridiem=0;
      if (hour == 12)       hour=0;
    }
    if (matcher.group(11).toLowerCase().equals("String_Node_Str")) {
      meridiem=1;
      if (hour != 12)       hour+=12;
    }
  }
  if (hour > 24)   return null;
  if (hour >= 12)   meridiem=1;
  result.index=matcher.start() + matcher.group(1).length();
  result.text=matcher.group().substring(matcher.group(1).length(),matcher.group().length() - matcher.group(12).length());
  result.start.assign(Components.Hour,hour);
  result.start.assign(Components.Minute,minute);
  result.start.assign(Components.Second,second);
  if (meridiem >= 0)   result.start.assign(Components.Meridiem,meridiem);
  Pattern secondPattern=Pattern.compile(SECOND_REG_PATTERN,Pattern.CASE_INSENSITIVE);
  matcher=secondPattern.matcher(text);
  if (!matcher.find(result.index + result.text.length())) {
    return result;
  }
  meridiem=-1;
  minute=0;
  second=0;
  hour=Integer.parseInt(matcher.group(2));
  if (matcher.group(5) != null) {
    minute=Integer.parseInt(matcher.group(5));
    if (minute >= 60)     return result;
  }
 else   if (hour > 100) {
    minute=hour % 100;
    hour=hour / 100;
  }
  if (matcher.group(8) != null) {
    second=Integer.parseInt(matcher.group(8));
    if (second >= 60)     return result;
  }
  if (matcher.group(10) != null) {
    if (hour > 12)     return result;
    if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
      if (hour == 12) {
        hour=0;
        if (result.end == null) {
          result.end=new ParsedDateComponent(result.start);
        }
        result.end.assign(Components.DayOfMonth,result.end.get(Components.DayOfMonth) + 1);
      }
    }
    if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
      if (hour != 12)       hour+=12;
    }
    if (!result.start.isCertain(Components.Meridiem)) {
      if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
        result.start.imply(Components.Meridiem,0);
        if (result.start.get(Components.Hour) == 12)         result.start.assign(Components.Hour,0);
      }
      if (matcher.group(10).toLowerCase().equals("String_Node_Str")) {
        result.start.imply(Components.Meridiem,1);
        if (result.start.get(Components.Hour) != 12)         result.start.assign(Components.Hour,result.start.get(Components.Hour) + 12);
      }
    }
  }
  if (hour >= 12)   meridiem=1;
  result.text=result.text + matcher.group();
  if (result.end == null) {
    result.end=new ParsedDateComponent(result.start);
  }
  result.end.assign(Components.Hour,hour);
  result.end.assign(Components.Minute,minute);
  result.end.assign(Components.Second,second);
  if (meridiem >= 0)   result.end.assign(Components.Meridiem,meridiem);
  return result;
}