for (int i = 0; i < threadCount; i++) {
            assertNull(exceptions[i], "Thread " + i + " threw exception");
        }

        // Verify all URLs were added
        synchronized (mockCallback) {
            assertEquals("All URLs should be added", threadCount * urlsPerThread, callback.deleteUrlList.size());
        }
    }

    /**
     * Test concurrent reads from deleteUrlList while synchronized.

        // Default constructor
    }

    /** URL filter for searching failure URLs. */
    //@Maxbytelength(maxbytelength = 1000)
    public String url;

    /** Minimum error count filter for searching failure URLs. */
    //@IntRange(min = 0, max = 2147483647)
    public String errorCountMin;

    /** Maximum error count filter for searching failure URLs. */
    //@IntRange(min = 0, max = 2147483647)

     * Adds a client with a regular expression pattern.
     * @param regex The regular expression to match URLs.
     * @param client The CrawlerClient instance.
     */
    public void addClient(final String regex, final CrawlerClient client) {
        if (StringUtil.isBlank(regex)) {
            throw new CrawlerSystemException(
                    "URL pattern regular expression is null or blank. Cannot register client without a valid pattern.");
        }

                                        <label for="urls" class="col-sm-2 text-sm-right col-form-label"><la:message
                                                key="labels.urls"/></label>
                                        <div class="col-sm-10">
                                            <la:text styleId="urls" property="urls" styleClass="form-control"/>
                                        </div>

     */
    @Size(max = 1000)
    public String description;

    /**
     * The URLs to be crawled by this web configuration.
     */
    @Required
    @UriType(protocolType = ProtocolType.WEB)
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String urls;

    /**
     * URL patterns to include during crawling.
     */
    @CustomSize(maxKey = "form.admin.max.input.size")

     */
    public SearchForm() {
    }

    /**
     * The name field for searching web configurations.
     */
    public String name;

    /**
     * The URLs field for searching web configurations.
     */
    public String urls;

    /**
     * The description field for searching web configurations.
     */
    public String description;

### Quotes

- Prefer Ukrainian guillemets «…» for quoted terms in prose, matching existing Ukrainian docs.
- Never change quotes inside inline code, code blocks, URLs, or file paths.

### Ellipsis

- Keep ellipsis style consistent with existing Ukrainian docs.
- Never change `...` in code, URLs, or CLI examples.

### Preferred translations / glossary

Use the following preferred translations when they apply in documentation prose:

### Quotes

- Keep quote style consistent with existing Turkish docs (typically ASCII quotes in text).
- Never modify quotes inside inline code, code blocks, URLs, or file paths.

### Ellipsis

- Keep ellipsis style (`...`) consistent with existing Turkish docs.
- Never modify `...` in code, URLs, or CLI examples.

### Consistency

- Use the same translation for the same term throughout the document.

     */
    public String id;

    /**
     * Search criteria: configuration name.
     */
    public String name;

    /**
     * Search criteria: target URLs.
     */
    public String urls;

    /**
     * Search criteria: user agent string.
     */
    public String userAgent;

    /**
     * Search criteria: number of threads.
     */

            }
        }
        return result;
    }

    /**
     * Replaces URL for display or URL converter.
     *
     * @param url the URL to replace
     * @return the replaced URL
     */
    public String replaceUrl(final String url) { // for display or url converer
        if (cachedPathMappingList == null) {
            synchronized (this) {