* <p>
 * Pattern syntax supports:
 * <ul>
 *   <li>Standard glob patterns with {@code *}, {@code ?}, and {@code **} wildcards</li>
 *   <li>Explicit syntax prefixes like {@code "glob:"} or {@code "regex:"}</li>
 *   <li>Maven 3 compatible behavior for patterns without explicit syntax</li>
 *   <li>Default exclusion patterns for SCM files when requested</li>
 * </ul>
 *
 * @since 4.0.0
 * @see PathMatcher
 */
@Experimental

/**
 * A factory class for managing and creating crawler clients based on URL patterns.
 * This class implements AutoCloseable to properly handle resource cleanup.
 *
 * <p>The factory maintains a map of regular expression patterns to crawler clients,
 * allowing for URL-based client selection. Clients can be added with specific patterns
 * and optionally at specific positions in the processing order.</p>
 *

    }

    /**
     * Converts a GSA URL pattern into a regular expression pattern suitable for Fess.
     * Handles various GSA pattern formats including regexp, contains, and URL-based patterns.
     *
     * @param s the input GSA pattern string
     * @return a regular expression pattern string, or empty string for comments/invalid patterns
     */
    protected String getFilterPath(final String s) {

    }

    /**
     * Gets the list of include URL patterns for the specified session.
     *
     * @param sessionId The session ID.
     * @return The list of compiled include patterns.
     * @throws CrawlerSystemException if the patterns cannot be loaded.
     */
    @Override
    public List<Pattern> getIncludeUrlPatternList(final String sessionId) {
        try {

    /** Map of session IDs to include URL patterns for filtering URLs. */
    protected volatile Map<String, List<Pattern>> includeUrlPatternMap = new HashMap<>();

    /** Map of session IDs to exclude URL patterns for filtering URLs. */
    protected volatile Map<String, List<Pattern>> excludeUrlPatternMap = new HashMap<>();

    /**
     * Creates a new MemoryDataHelper instance.

        String sessionId = "test-session-024";
        urlFilter.init(sessionId);

        // Test empty pattern
        urlFilter.addInclude("");
        urlFilter.addExclude("");

        // Test single character pattern
        urlFilter.addInclude(".");
        urlFilter.addExclude("*");

        // Test patterns with only special characters
        urlFilter.addInclude("^$");
        urlFilter.addExclude(".*");

     * (java.lang.String)
     */
    /**
     * Retrieves a list of URL patterns to be excluded for a given session.
     * @param sessionId The ID of the session.
     * @return A list of compiled regular expression patterns.
     */
    @Override
    public List<Pattern> getExcludeUrlPatternList(final String sessionId) {
        return dataHelper.getExcludeUrlPatternList(sessionId);
    }

					symmetry = uint64(len(p.Seq))%ss == 0
				} else {
					symmetry = ss%uint64(len(p.Seq)) == 0
				}
			}
		}
		// With no arg patterns, it is expected that user knows
		// the right symmetry, so either ellipses patterns are
		// provided (recommended) or no ellipses patterns.
		if _, ok := newSetCounts[ss]; !ok && (symmetry || argPatterns == nil) {
			newSetCounts[ss] = struct{}{}
		}
	}

	setCounts = []uint64{}

     * @param regex the regular expression pattern
     */
    public void addRule(final String key, final String regex) {
        regexMap.put(key, Pattern.compile(regex));
    }

    /**
     * Adds a compiled regular expression rule for the specified field.
     * @param key the field name to match against
     * @param pattern the compiled regular expression pattern
     */

        final List<Pattern> includeList = getUrlFilterService().getIncludeUrlPatternList(sessionId);
        final List<Pattern> excludeList = getUrlFilterService().getExcludeUrlPatternList(sessionId);

        if (!includeList.isEmpty()) {
            boolean match = false;
            for (final Pattern pattern : includeList) {
                final Matcher matcher = pattern.matcher(url);