code: public String processPattern(String newPattern) throws IllegalArgumentException {
          int idx = 0;
          int offnum = -1;
          StringBuffer outpat = new StringBuffer();
          offsets = new int[BUFSIZE];
          arguments = new String[BUFSIZE];
          maxOffset = -1;
  
          //skipped = new RangeList();
          // What was this for??
          //process(newPattern, "\"", "\""); // NOI18N
          while (true) {
              int ridx = -1;
              int lidx = newPattern.indexOf(ldel, idx);
  
              /*
              Range ran = skipped.getRangeContainingOffset(lidx);
              if (ran != null) {
                  outpat.append(newPattern.substring(idx, ran.getEnd()));
                  idx = ran.getEnd(); continue;
              }
               */
              if (lidx >= 0) {
                  ridx = newPattern.indexOf(rdel, lidx + ldel.length());
              } else {
                  break;
              }
  
              if (++offnum >= BUFSIZE) {
                  throw new IllegalArgumentException(
                          "TooManyArguments"
                  );
              }
  
              if (ridx < 0) {
                  if (exactmatch) {
                      throw new IllegalArgumentException(
                              "UnmatchedBraces"
                      );
                  } else {
                      break;
                  }
              }
  
              outpat.append(newPattern.substring(idx, lidx));
              offsets[offnum] = outpat.length();
              arguments[offnum] = newPattern.substring(lidx + ldel.length(), ridx);
              idx = ridx + rdel.length();
              maxOffset++;
          }
  
          outpat.append(newPattern.substring(idx));
  
          return outpat.toString();
      }
docs: Scans the pattern and prepares internal variables.
  
  @param newPattern String to be parsed.
  @throws IllegalArgumentException if number of arguments exceeds BUFSIZE or
  parser found unmatched brackets (this exception should be switched off
  using setExactMatch(false)).