Program: 86538
Project: 86538
Buggy source:
/** 
 * Matches a version object to versions in a set by comparing the non build number portion of the string. Then find which of the matching versions has the highest build number and is therefore the latest version.
 * @param version
 * @param versionSet
 * @return The highest build number, or 0 if no matching build numbers are found.
 */
public int findHighestMatchingBuildNumber(Version version,Set<String> versionSet){
  int highestBuildNum=0;
  StringBuffer versionPatternBuf=new StringBuffer();
  versionPatternBuf.append("String_Node_Str");
  versionPatternBuf.append(Pattern.quote(getOriginalMMM()));
  versionPatternBuf.append("String_Node_Str");
  versionPatternBuf.append(DELIMITER_REGEX);
  if (version.getQualifierBase() != null) {
    versionPatternBuf.append(Pattern.quote(version.getQualifierBase()));
    versionPatternBuf.append(DELIMITER_REGEX);
  }
  versionPatternBuf.append("String_Node_Str");
  versionPatternBuf.append("String_Node_Str");
  versionPatternBuf.append("String_Node_Str");
  String candidatePatternStr=versionPatternBuf.toString();
  logger.debug("String_Node_Str",candidatePatternStr);
  final Pattern candidateSuffixPattern=Pattern.compile(candidatePatternStr);
  for (  final String compareVersion : versionSet) {
    final Matcher candidateSuffixMatcher=candidateSuffixPattern.matcher(compareVersion);
    if (candidateSuffixMatcher.matches()) {
      String buildNumberStr=candidateSuffixMatcher.group(2);
      int compareBuildNum=Integer.parseInt(buildNumberStr);
      if (compareBuildNum > highestBuildNum) {
        highestBuildNum=compareBuildNum;
      }
    }
  }
  return highestBuildNum;
}

Fixed version (ground truth):
/** 
 * Matches a version object to versions in a set by comparing the non build number portion of the string. Then find which of the matching versions has the highest build number and is therefore the latest version.
 * @param version
 * @param versionSet
 * @return The highest build number, or 0 if no matching build numbers are found.
 */
public int findHighestMatchingBuildNumber(Version version,Set<String> versionSet){
  int highestBuildNum=0;
  StringBuffer versionPatternBuf=new StringBuffer();
  versionPatternBuf.append("String_Node_Str");
  versionPatternBuf.append(Pattern.quote(getOriginalMMM()));
  versionPatternBuf.append("String_Node_Str" + DELIMITER_REGEX + "String_Node_Str");
  versionPatternBuf.append("String_Node_Str");
  versionPatternBuf.append(DELIMITER_REGEX);
  if (version.getQualifierBase() != null) {
    versionPatternBuf.append(Pattern.quote(version.getQualifierBase()));
    versionPatternBuf.append(DELIMITER_REGEX);
  }
  versionPatternBuf.append("String_Node_Str");
  String candidatePatternStr=versionPatternBuf.toString();
  logger.debug("String_Node_Str",candidatePatternStr);
  final Pattern candidateSuffixPattern=Pattern.compile(candidatePatternStr);
  for (  final String compareVersion : versionSet) {
    final Matcher candidateSuffixMatcher=candidateSuffixPattern.matcher(compareVersion);
    if (candidateSuffixMatcher.matches()) {
      String buildNumberStr=candidateSuffixMatcher.group(3);
      int compareBuildNum=Integer.parseInt(buildNumberStr);
      if (compareBuildNum > highestBuildNum) {
        highestBuildNum=compareBuildNum;
      }
    }
  }
  return highestBuildNum;
}