assertNotNull(ArbitraryInstances.get(GenericDeclaration.class));
  }

  public void testGet_regex() {
    assertEquals(Pattern.compile("").pattern(), ArbitraryInstances.get(Pattern.class).pattern());
    assertEquals(0, ArbitraryInstances.get(MatchResult.class).groupCount());
  }

  public void testGet_usePublicConstant() {

Але тепер Ви знаєте, що коли вони знадобляться, їх можна застосовувати у **FastAPI**.

### Pydantic v1 `regex` замість `pattern`

До версії Pydantic 2 і FastAPI 0.100.0 параметр називався `regex` замість `pattern`, але тепер він застарів.

Ви все ще можете зустріти код, який використовує його:

//// tab | Pydantic v1

{
  "resources": [
    {"pattern": "web-platform-test-urltestdata.txt"}
  ]

				</div>
				<div class="info">
					<fmt:formatDate value="${fe:parseDate(doc.last_modified)}" type="BOTH" pattern="yyyy-MM-dd HH:mm" />
					<c:if test="${doc.last_modified==null || doc.last_modified==''}">
						<fmt:formatDate value="${fe:parseDate(doc.created)}" type="BOTH" pattern="yyyy-MM-dd HH:mm" />
					</c:if>
					<c:if test="${doc.content_length!=null && doc.content_length!=''}">
						<div class="d-sm-none"></div>

   * Returns the value associated with {@code key} in this cache, obtaining that value from {@code
   * loader} if necessary. The method improves upon the conventional "if cached, return; otherwise
   * create, cache and return" pattern. For further improvements, use {@link LoadingCache} and its
   * {@link LoadingCache#get(Object) get(K)} method instead of this one.
   *

          .put(BigInteger.class, BigInteger.ZERO)
          .put(BigDecimal.class, BigDecimal.ZERO)
          .put(CharSequence.class, "")
          .put(String.class, "")
          .put(Pattern.class, Pattern.compile(""))
          .put(MatchResult.class, createMatchResult())
          .put(TimeUnit.class, SECONDS)
          .put(Charset.class, UTF_8)
          .put(Currency.class, Currency.getInstance(Locale.US))

public class CharMappingCreator extends DictionaryCreator {
    private static final Logger logger = LogManager.getLogger(CharMappingCreator.class);

    /**
     * Constructs a new CharMappingCreator with the mapping file pattern.
     */
    public CharMappingCreator() {
        super("mapping.*\\.txt");
    }

    /**
     * Registers this creator with the dictionary manager after construction.
     */
    @PostConstruct

    /**
     * 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
     */

		</get>
		<delete dir="${site.dir}/kopf" />
		<unzip dest="${site.dir}/kopf" src="${target.dir}/kopf.zip">
			<patternset>
				<include name="elasticsearch-kopf-${kopf.branch}/_site/**" />
			</patternset>
			<cutdirsmapper dirs="2" />
		</unzip>
		<delete>
			<fileset dir="${webinf.dir}/plugin">
				<include name="**/*.jar" />
			</fileset>
		</delete>
	</target>

     */
    public XpathTransformer() {
        super();
    }

    private static final Logger logger = LogManager.getLogger(XpathTransformer.class);

    private static final Pattern SPACE_PATTERN = Pattern.compile("\\s+", Pattern.MULTILINE);

    /**
     * A map of field rules, where the key is the field name and the value is the XPath expression.
     */