StringBuilder buf = new StringBuilder((len * 3 / 2) + 16);

    int oldpos = 0;
    do {
      buf.append(string, oldpos, pos);
      buf.append(replacement);
      oldpos = pos + 1;
      pos = indexIn(string, oldpos);
    } while (pos != -1);

    buf.append(string, oldpos, len);
    return buf.toString();
  }

  /**

        sb.append(message);

        if (message == null || !message.contains("from the specified remote repositories:")) {
            sb.append(LS);
            sb.append("  ")
                    .append(groupId)
                    .append(':')
                    .append(artifactId)
                    .append(':')
                    .append(type)
                    .append(':')
                    .append(version);

            xml.append("        <artifactId>").append(parent.artifactId).append("</artifactId>\n");
            xml.append("        <version>").append(parent.version).append("</version>\n");
            xml.append("    </parent>\n");
        }

        if (groupId != null) {
            xml.append("    <groupId>").append(groupId).append("</groupId>\n");
        }
        if (artifactId != null) {

                .append(ls);
        version.append("OS name: \"")
                .append(Os.OS_NAME)
                .append("\", version: \"")
                .append(Os.OS_VERSION)
                .append("\", arch: \"")
                .append(Os.OS_ARCH)
                .append("\", family: \"")
                .append(Os.OS_FAMILY)
                .append('\"');

	}

	// Append
	DB.Model(&users).Association("Pets").Append(
		&Pet{Name: "pet-slice-append-1"},
		[]*Pet{{Name: "pet-slice-append-2-1"}, {Name: "pet-slice-append-2-2"}},
		&Pet{Name: "pet-slice-append-3"},
	)

	AssertAssociationCount(t, users, "Pets", 10, "After Append")

	// Replace -> same as append
	DB.Model(&users).Association("Pets").Replace(

        StringBuilder message = new StringBuilder();
        message.append(action).append(' ').append(direction).append(' ').append(resource.getRepositoryId());
        message.append(": ");
        message.append(resource.getRepositoryUrl())
                .append(resource.getResourceName())
                .append(" (");
        format.format(message, contentLength);

        json.append("{");
        json.append("\"timestamp\":\"").append(escapeJson(entry.timestamp.toString())).append("\",");
        json.append("\"eventType\":\"").append(entry.eventType.name()).append("\",");
        json.append("\"severity\":\"").append(entry.severity.name()).append("\",");
        json.append("\"message\":\"").append(escapeJson(entry.message)).append("\"");

        if (!entry.context.isEmpty()) {

	}

	// Append
	DB.Model(&users).Association("Account").Append(
		&Account{Number: "account-slice-append-1"},
		&Account{Number: "account-slice-append-2"},
		&Account{Number: "account-slice-append-3"},
	)

	AssertAssociationCount(t, users, "Account", 3, "After Append")

	// Replace -> same as append

	// Delete

                buff.append('[');
                buff.append(md.getExecuteLifecycle());
                buff.append(']');
            }
            buff.append(md.getExecutePhase());
        } else {
            // forked goal
            buff.append(':');
            buff.append(md.getExecuteGoal());
        }
        buffer.strong(buff.toString());
    }

            final StringBuilder b = new StringBuilder();
            b.append('"').append(StringEscapeUtils.escapeJson(p.getName())).append("\":{");
            append(b, "count", () -> p.getCount()).append(',');
            append(b, "used", () -> p.getUsed().getBytes()).append(',');
            append(b, "capacity", () -> p.getTotalCapacity().getBytes()).append('}');
            return b.toString();