Method appendReplacementInternal

java/com/google/re2j/Matcher.java:485–545

(StringBuilder sb, String replacement)

  }

  private void appendReplacementInternal(StringBuilder sb, String replacement) {
    int last = 0;
    int i = 0;
    int m = replacement.length();
    for (; i < m - 1; i++) {
      if (replacement.charAt(i) == '\\') {
        if (last < i) {
          sb.append(replacement.substring(last, i));
        }
        i++;
        last = i;
        continue;
      }
      if (replacement.charAt(i) == '$') {
        int c = replacement.charAt(i + 1);
        if ('0' <= c && c <= '9') {
          int n = c - '0';
          if (last < i) {
            sb.append(replacement.substring(last, i));
          }
          for (i += 2; i < m; i++) {
            c = replacement.charAt(i);
            if (c < '0' || c > '9' || n * 10 + c - '0' > groupCount) {
              break;
            }
            n = n * 10 + c - '0';
          }
          if (n > groupCount) {
            throw new IndexOutOfBoundsException("n > number of groups: " + n);
          }
          String group = group(n);
          if (group != null) {
            sb.append(group);
          }
          last = i;
          i--;
          continue;
        } else if (c == '{') {
          if (last < i) {
            sb.append(replacement.substring(last, i));
          }
          i++; // skip {
          int j = i + 1;
          while (j < replacement.length()
              && replacement.charAt(j) != '}'
              && replacement.charAt(j) != ' ') {
            j++;
          }
          if (j == replacement.length() || replacement.charAt(j) != '}') {
            throw new IllegalArgumentException("named capture group is missing trailing '}'");
          }
          String groupName = replacement.substring(i + 1, j);
          sb.append(group(groupName));
          last = j + 1;
        }
      }
    }
    if (last < m) {