Example #1
0
  /**
   * This function replace only the first pattern matched with the replacement.
   *
   * @param pattern pattern string to match
   * @param input input string
   * @param replacement replacement string
   * @return returns the processed string
   * @exception throws a FrameworkException when the pattern/replacement is null.
   */
  public static String replaceLast(String pattern, String input, String replacement)
      throws FrameworkException {
    if ((pattern == null) || (input == null) || (replacement == null)) {
      throw new FrameworkException(
          "RegexUtil: replaceLast(): pattern or input cannot be null. "
              + "pattern = "
              + pattern
              + "input = "
              + input
              + "replacement = "
              + replacement);
    }

    Perl5Util util = new Perl5Util();
    MatchResult matchResult = null;
    String result = null;
    String pre = null;
    String post = null;
    StringBuffer resultBuffer = new StringBuffer();

    int length = input.length();

    String regex = makePerl5SubstitutionPattern(pattern, replacement);
    pattern = makePerl5MatchPattern(pattern);

    // counts the number of match and grab the last one
    while (util.match(pattern, input)) {
      // getting the string before match
      pre = util.preMatch();
      resultBuffer.append(pre);

      // get the matched string
      matchResult = util.getMatch();
      resultBuffer.append(matchResult.toString());

      // get the post string after the match
      post = util.postMatch();

      // the post becomes the new input
      input = post;
    }

    // get the last match found
    matchResult = util.getMatch();

    // do the string replacement on the pattern found
    result = util.substitute(regex, matchResult.toString());

    resultBuffer.append(result);
    resultBuffer.append(post);

    return resultBuffer.toString();
  }
Example #2
0
  /**
   * The function checks and handles the situation where another begin token is found in between the
   * first begin token and the first end token. Such first beginToken is ignored. The current input
   * to be passed in to the replacement function will be the string between the LAST begin token and
   * the FIRST end token found.
   *
   * @param beginToken the pattern to look for
   * @param current input string
   * @param resultBuffer the buffer to hold the result
   * @return returns a Vector containing the substrings of the input that occur
   */
  private static final String skipOrphanedBeginToken(
      String beginToken, String current, StringBuffer resultBuffer) {
    Perl5Util util = new Perl5Util();
    boolean nextBeginTokenMatch = true;
    MatchResult matchResult = null;
    String remainderStr = null;
    String subCurrent = null;
    StringBuffer currentBuffer = new StringBuffer();
    String pre = null;

    // subCurrent is copy of the current to check if there is any next beginTokens
    subCurrent = current;

    while (nextBeginTokenMatch) {
      nextBeginTokenMatch = util.match(beginToken, subCurrent);

      if (nextBeginTokenMatch == true) {
        // pre is the string before the beginToken
        pre = util.preMatch();
        currentBuffer.append(pre);

        // get the  matched beginToken
        matchResult = util.getMatch();
        currentBuffer.append(matchResult.toString());

        // get the remaining string after the beginToken
        remainderStr = util.postMatch();
        subCurrent = remainderStr;
      } else // there is no match
      {
        // appending the string before the last begin token to the result
        resultBuffer.append(currentBuffer.toString());

        // finally get the string to perform the substitution on
        current = subCurrent;
        break;
      }
    } // while

    return current;
  }