private static final Pattern ATTRIBUTE_SEPARATOR = Pattern.compile("\\s*=\\s*");
    private static final Pattern END_ELEMENT_NAME = Pattern.compile("\\s+|(/>)|>");
    private static final Pattern END_ELEMENT = Pattern.compile("(/>)|>");
    private static final Pattern HTML_ENCODED_CHAR = Pattern.compile("&#\\d+;");
    private static final Pattern HTML_ENTITY = Pattern.compile("&.+?;");

    }

    /**
     * Converts to {@link Float}.
     *
     * @param o
     *            The object to convert
     * @param pattern
     *            The pattern string
     * @return The converted {@link Float}
     */
    public static Float toFloat(final Object o, final String pattern) {
        if (o == null) {
            return null;
        } else if (o instanceof Float) {
            return (Float) o;

  }

  static String stringValueOf(@Nullable Object o) {
    return String.valueOf(o);
  }

  static CommonPattern compilePattern(String pattern) {
    Preconditions.checkNotNull(pattern);
    return patternCompiler.compile(pattern);
  }

  static boolean patternCompilerIsPcreLike() {
    return patternCompiler.isPcreLike();
  }

  private static PatternCompiler loadPatternCompiler() {

     *
     * @param cmdList the command list to add properties to
     * @param regex the regular expression pattern to match property names
     */
    protected void addFessCustomSystemProperties(final List<String> cmdList, final String regex) {
        if (StringUtil.isNotBlank(regex)) {
            final Pattern pattern = Pattern.compile(regex);

        // Pattern uses Object (identity) equality, so we have to reach
        // inside to compare individual fields.
        return Objects.equals(pattern.pattern(), that.pattern.pattern())
            && pattern.flags() == that.pattern.flags();
      }
      return false;
    }

    @Override
    public String toString() {
      String patternString =

    }

    /**
     * Gets the compiled pattern for matching sensitive property/environment variable keys.
     * The pattern is read from the system property 'app.log.sensitive.property.pattern'.
     * If not set, a default pattern matching common sensitive key names is used.
     *
     * @return The compiled Pattern for sensitive key matching
     */
    private static Pattern getSensitivePattern() {

    /** The paths to include during crawling (pattern-based). */
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String includedPaths;

    /** The paths to exclude during crawling (pattern-based). */
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String excludedPaths;

    /** The document paths to include in search results (pattern-based). */
    @CustomSize(maxKey = "form.admin.max.input.size")

    private static final Pattern ALLOWED_WRAPPER_VERSION =
        Pattern.compile("^[0-9.]+(-(rc|milestone|m)-[0-9]+)?$");

    // Keep the same extraction semantics as the old sed:
    //   sed 's/.*gradle-\(.*\)-[a-z]*\.[a-z]*/\1/'
    private static final Pattern WRAPPER_VERSION_EXTRACT =
        Pattern.compile(".*gradle-(.*)-[a-z]*\\.[a-z]*");

			<PatternLayout><Pattern>${log.pattern}</Pattern></PatternLayout><!-- <EcsLayout serviceName="fess" eventDataset="app" /> -->
			<Policies>
				<TimeBasedTriggeringPolicy />
				<SizeBasedTriggeringPolicy size="100 MB" />
			</Policies>
			<DefaultRolloverStrategy fileIndex="max" min="1"
				max="${backup.max.history}" compressionLevel="9">

   *     example, {@code "rpc-pool-%d"} will generate thread names like {@code "rpc-pool-0"}, {@code
   *     "rpc-pool-1"}, {@code "rpc-pool-2"}, etc.
   * @return this for the builder pattern
   */
  @CanIgnoreReturnValue
  public ThreadFactoryBuilder setNameFormat(String nameFormat) {
    String unused = format(nameFormat, 0); // fail fast if the format is bad or null
    this.nameFormat = nameFormat;