if (entry != null && entry.key == key) {
      return entry.value;
    }
    entry = cacheEntry2;
    if (entry != null && entry.key == key) {
      // Promote second cache entry to first so the access pattern
      // [K1, K2, K1, K3, K1, K4...] still hits the cache half the time.
      addToCache(entry);
      return entry.value;
    }
    return null;
  }

  @Override
  void clearCache() {

Pero cuando las necesites y vayas a aprenderlas, ya sabes que puedes usarlas directamente en **FastAPI**.

### Pydantic v1 `regex` en lugar de `pattern`

Antes de la versión 2 de Pydantic y antes de FastAPI 0.100.0, el parámetro se llamaba `regex` en lugar de `pattern`, pero ahora está en desuso.

Todavía podrías ver algo de código que lo usa:

//// tab | Pydantic v1

    private static final String CRAWLER_PARAM_PREFIX = "crawler.param.";

    private static final Object CRAWLER_FILE_AUTH = "crawler.file.auth";

    protected Pattern[] includedDocPathPatterns;

    protected Pattern[] excludedDocPathPatterns;

    protected Map<String, String> handlerParameterMap;

    protected Map<String, String> handlerScriptMap;

		if err := event.ValidateFilterRuleValue(values[peerRESTListenSuffix][0]); err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		suffix = values[peerRESTListenSuffix][0]
	}

	pattern := event.NewPattern(prefix, suffix)

	var eventNames []event.Name
	var mask pubsub.Mask
	for _, s := range values[peerRESTListenEvents] {
		eventName, err := event.ParseName(s)
		if err != nil {

        @Test
        @DisplayName("All fragment flags should have unique values")
        void testFragmentFlagsUniqueness() {
            // Verify that fragment flags are unique and follow bit pattern
            assertEquals(1, Integer.bitCount(DcerpcConstants.DCERPC_FIRST_FRAG), "DCERPC_FIRST_FRAG should be a single bit");

 * more methods to modify the behavior of the backing deque as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>Warning:</b> The methods of {@code ForwardingDeque} forward <b>indiscriminately</b> to the
 * methods of the delegate. For example, overriding {@link #add} alone <b>will not</b> change the

            }
        }
    }

    public void test_constructor_isPrivate() {
        // Verify that SystemUtil has a private constructor (utility class pattern)
        try {
            Constructor<SystemUtil> constructor = SystemUtil.class.getDeclaredConstructor();
            assertTrue("Constructor should be private", java.lang.reflect.Modifier.isPrivate(constructor.getModifiers()));

     */
    protected Map<String, CorsHandler> handerMap = new HashMap<>();

    /**
     * Adds a CORS handler for the specified origin.
     *
     * @param origin the origin pattern (can be "*" for wildcard)
     * @param handler the CORS handler to associate with the origin
     */
    public void add(final String origin, final CorsHandler handler) {
        if (logger.isDebugEnabled()) {

    /**
     * Creates a directory entry enumeration iterator.
     *
     * @param th the SMB tree handle for the connection
     * @param parent the parent resource being enumerated
     * @param wildcard the wildcard pattern for filtering entries
     * @param filter additional resource name filter to apply
     * @param searchAttributes the file attributes to search for
     * @throws CIFSException if an error occurs during initialization
     */

 * override one or more methods to modify the behavior of the backing multimap as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations