Program: 92558
Project: 92558
Buggy source:
@Override public String[] split(String text){
  ArrayList<String> sentences=new ArrayList<>();
  int len=0;
  text=REGEX_CARRIAGE_RETURN.matcher(text).replaceAll("String_Node_Str");
  text=text.replace('\031',' ');
  text=REGEX_FORGOTTEN_SPACE.matcher(text).replaceAll("String_Node_Str");
  text=text + "String_Node_Str";
  Matcher matcher=REGEX_SENTENCE.matcher(text);
  StringBuilder currentSentence=new StringBuilder();
  int end=0;
  while (matcher.find()) {
    end=matcher.end();
    String sentence=matcher.group(1).trim();
    String punctuation=matcher.group(2);
    String stuffAfterPeriod=matcher.group(3);
    if (stuffAfterPeriod == null) {
      stuffAfterPeriod=matcher.group(5);
      if (stuffAfterPeriod == null) {
        stuffAfterPeriod="String_Node_Str";
      }
 else {
        end=matcher.end(5);
      }
    }
 else {
      end=matcher.end(3);
    }
    String[] words=REGEX_WHITESPACE.split(sentence);
    len+=words.length;
    String nextWord=matcher.group(4);
    if (nextWord == null) {
      nextWord="String_Node_Str";
    }
    if (punctuation.compareTo("String_Node_Str") == 0) {
      Matcher lastWordMatcher=REGEX_LAST_WORD.matcher(sentence);
      String lastWord="String_Node_Str";
      if (lastWordMatcher.find()) {
        lastWord=lastWordMatcher.group();
      }
      if ((!lastWord.matches("String_Node_Str") && lastWord.matches("String_Node_Str") && !lastWord.matches("String_Node_Str")) || lastWord.matches("String_Node_Str") || (lastWord.matches("String_Node_Str") && !lastWord.matches("String_Node_Str"))|| EnglishAbbreviations.contains(lastWord.toLowerCase())) {
        if (EnglishDictionary.CONCISE.contains(nextWord) && len > 6) {
          currentSentence.append(sentence);
          currentSentence.append(punctuation);
          currentSentence.append(stuffAfterPeriod.trim());
          sentences.add(currentSentence.toString());
          currentSentence=new StringBuilder();
          len=0;
        }
 else {
          currentSentence.append(sentence);
          currentSentence.append(punctuation);
          if (stuffAfterPeriod.indexOf('\031') == -1) {
            currentSentence.append(' ');
          }
        }
      }
 else {
        currentSentence.append(sentence);
        currentSentence.append(punctuation);
        currentSentence.append(stuffAfterPeriod.trim());
        sentences.add(currentSentence.toString());
        currentSentence=new StringBuilder();
        len=0;
      }
    }
 else {
      if (punctuation.matches("String_Node_Str") || (punctuation.compareTo("String_Node_Str") == 0 && len > 6)) {
        currentSentence.append(sentence);
        currentSentence.append(punctuation);
        currentSentence.append(stuffAfterPeriod.trim());
        sentences.add(currentSentence.toString());
        currentSentence=new StringBuilder();
        len=0;
      }
 else {
        currentSentence.append(sentence);
        currentSentence.append(punctuation);
        if (stuffAfterPeriod.indexOf('\031') == -1) {
          currentSentence.append(' ');
        }
      }
    }
  }
  if (end < text.length()) {
    String lastPart=text.substring(end).trim();
    if (!lastPart.isEmpty()) {
      sentences.add(lastPart);
    }
  }
  String[] result=new String[sentences.size()];
  for (int i=0; i < result.length; i++) {
    result[i]=sentences.get(i).replaceAll("String_Node_Str","String_Node_Str");
  }
  return result;
}

Fixed version (ground truth):
@Override public String[] split(String text){
  ArrayList<String> sentences=new ArrayList<>();
  int len=0;
  text=REGEX_CARRIAGE_RETURN.matcher(text).replaceAll("String_Node_Str");
  text=text.replace('\031',' ');
  text=REGEX_FORGOTTEN_SPACE.matcher(text).replaceAll("String_Node_Str");
  text=text + "String_Node_Str";
  Matcher matcher=REGEX_SENTENCE.matcher(text);
  StringBuilder currentSentence=new StringBuilder();
  int end=0;
  while (matcher.find()) {
    end=matcher.end();
    String sentence=matcher.group(1).trim();
    String punctuation=matcher.group(2);
    String stuffAfterPeriod=matcher.group(3);
    if (stuffAfterPeriod == null) {
      stuffAfterPeriod=matcher.group(5);
      if (stuffAfterPeriod == null) {
        stuffAfterPeriod="String_Node_Str";
      }
 else {
        end=matcher.end(5);
      }
    }
 else {
      end=matcher.end(3);
    }
    String[] words=REGEX_WHITESPACE.split(sentence);
    len+=words.length;
    String nextWord=matcher.group(4);
    if (nextWord == null) {
      nextWord="String_Node_Str";
    }
    if (punctuation.compareTo("String_Node_Str") == 0) {
      Matcher lastWordMatcher=REGEX_LAST_WORD.matcher(sentence);
      String lastWord="String_Node_Str";
      if (lastWordMatcher.find()) {
        lastWord=lastWordMatcher.group();
      }
      if ((!lastWord.matches("String_Node_Str") && lastWord.matches("String_Node_Str") && !lastWord.matches("String_Node_Str")) || lastWord.matches("String_Node_Str") || (lastWord.matches("String_Node_Str") && !lastWord.matches("String_Node_Str"))|| EnglishAbbreviations.contains(lastWord.toLowerCase())) {
        if (EnglishDictionary.CONCISE.contains(nextWord) && len > 6) {
          currentSentence.append(sentence);
          currentSentence.append(punctuation);
          currentSentence.append(stuffAfterPeriod.trim());
          sentences.add(currentSentence.toString());
          currentSentence=new StringBuilder();
          len=0;
        }
 else {
          currentSentence.append(sentence);
          currentSentence.append(punctuation);
          if (stuffAfterPeriod.indexOf('\031') == -1) {
            currentSentence.append(' ');
          }
        }
      }
 else {
        currentSentence.append(sentence);
        currentSentence.append(punctuation);
        currentSentence.append(stuffAfterPeriod.trim());
        sentences.add(currentSentence.toString());
        currentSentence=new StringBuilder();
        len=0;
      }
    }
 else {
      if (punctuation.matches("String_Node_Str") || (punctuation.compareTo("String_Node_Str") == 0 && len > 6)) {
        currentSentence.append(sentence);
        currentSentence.append(punctuation);
        currentSentence.append(stuffAfterPeriod.trim());
        sentences.add(currentSentence.toString());
        currentSentence=new StringBuilder();
        len=0;
      }
 else {
        currentSentence.append(sentence);
        currentSentence.append(punctuation);
        if (stuffAfterPeriod.indexOf('\031') == -1) {
          currentSentence.append(' ');
        }
      }
    }
  }
  if (end < text.length()) {
    String lastPart=text.substring(end);
    if (!lastPart.isEmpty()) {
      currentSentence.append(lastPart);
    }
  }
  if (currentSentence.length() > 0) {
    sentences.add(currentSentence.toString().trim());
  }
  String[] result=new String[sentences.size()];
  for (int i=0; i < result.length; i++) {
    result[i]=sentences.get(i).replaceAll("String_Node_Str","String_Node_Str");
  }
  return result;
}