<li>{@code contains(string, substring)}: Checks if the string contains the substring.</li>
            <li>{@code matches(string, regex)}: Checks if the string matches the given regular expression.</li>
            <li>{@code not(condition)}: Negates the given condition.</li>

   * @since 14.0
   */
  @GwtIncompatible // regular expressions
  public static @Nullable Float tryParse(String string) {
    if (Doubles.FLOATING_POINT_PATTERN.matcher(string).matches()) {
      // TODO(lowasser): could be potentially optimized, but only with
      // extensive testing
      try {
        return Float.parseFloat(string);
      } catch (NumberFormatException e) {

			path:   kmsKeyListPath,
			query:  map[string]string{"pattern": "*"},
			asRoot: false,

			// It looks like this should allow listing any key that isn't "default-test-key", however
			// the policy engine matches all Deny statements first, without regard to Resources (for KMS).
			// This is for backwards compatibility where historically KMS statements ignored Resources.
			policy: `{
						"Effect": "Allow",

      public String toString() {
        return string;
      }
    };
  }

  @Generates
  CharMatcher generateCharMatcher() {
    return new CharMatcher() {
      @Override
      public boolean matches(char c) {
        return false;
      }

      final String string = paramString(CharMatcher.class, generateInt());

      @Override
      public String toString() {
        return string;
      }

   * hasNext()} method will return {@code false}.
   *
   * <p><b>Warning:</b> avoid using a {@code predicate} that matches {@code null}. If {@code null}
   * is matched in {@code iterator}, a NullPointerException will be thrown.
   *
   * @since 11.0
   */
  public static <T> Optional<T> tryFind(Iterator<T> iterator, Predicate<? super T> predicate) {

 *  Fix: Don't reuse a connection on redirect if certs match but DNS does not. For better
    locality and performance OkHttp attempts to use the same pooled connection across redirects and
    follow-ups. It independently shares connections when the IP addresses and certificates match,
    even if the host names do not. In 4.4.0 we introduced a regression where we shared a connection

            final String key = e.getKey();
            if (StringUtil.isBlank(key)) {
                return false;
            }
            return pattern.matcher(key).matches();
        }).collect(Collectors.toMap(Entry<String, String>::getKey, Entry<String, String>::getValue));
    }

    /**
     * Gets a map of environment variables.
     *

   * @since 14.0
   */
  @GwtIncompatible // regular expressions
  public static @Nullable Double tryParse(String string) {
    if (FLOATING_POINT_PATTERN.matcher(string).matches()) {
      // TODO(lowasser): could be potentially optimized, but only with
      // extensive testing
      try {
        return Double.parseDouble(string);
      } catch (NumberFormatException e) {

// - Check if a bucket has an entry in etcd backend
// -- If no, make an entry
// -- If yes, check if the entry matches local IP check if we
//
//	need to update the entry then proceed to update
//
// -- If yes, check if the IP of entry matches local IP.
//
//	This means entry is for this instance.
//
// -- If IP of the entry doesn't match, this means entry is
//
//	for another instance. Log an error to console.

        
        client.close();
    } finally {
        mockService.stop();
    }
}
```

### 7.2 Integration Tests
```java
@Test
@EnabledIfSystemProperty(named = "witness.test.enabled", matches = "true")
public void testWitnessFailover() throws Exception {
    // Requires cluster environment for testing
    CIFSContext context = getTestContext();