* @return the extracted value, or null if no match
     */
    protected String getValue(final Pattern pattern, final String line) {
        final Matcher m = pattern.matcher(line);
        if (m.matches() && m.groupCount() > 0) {
            return m.group(1);
        }
        return null;
    }

    /**
     * Strips comments from a line (everything after '#' character).

        boolean matched = false;
        for (Iterator<String> i = patterns.iterator(); i.hasNext() & !matched; ) {
            // TODO what about wildcards? Just specifying groups? versions?
            if (id.equals(i.next())) {
                matched = true;
            }
        }
        return matched;
    }

    public List<String> getPatterns() {

* Fix watch to not send the same set of events multiple times causing watcher to go back in time ([#73845](https://github.com/kubernetes/kubernetes/pull/73845), [@wojtek-t](https://github.com/wojtek-t))

        """
        Search for credentials with client_grants
        """
        if self.cid is not None:
            fetcher = self._create_credentials_fetcher()
            return RefreshableCredentials.create_from_metadata(
                metadata=fetcher(),
                refresh_using=fetcher,
                method=self.METHOD,
            )
        else:
            return None

      CallEnd::class,
    )
  }

  private fun assertBytesReadWritten(
    listener: EventRecorder,
    requestHeaderLength: Matcher<Long?>?,
    requestBodyBytes: Matcher<Long?>?,
    responseHeaderLength: Matcher<Long?>?,
    responseBodyBytes: Matcher<Long?>?,
  ) {
    if (requestHeaderLength != null) {
      val responseHeadersEnd = listener.removeUpToEvent<RequestHeadersEnd>()

                    addViolation(
                            problems, Severity.ERROR, "pluginGroups.pluginGroup[" + i + "]", null, "must not be empty");
                } else if (!ID_REGEX.matcher(pluginGroup).matches()) {
                    addViolation(
                            problems,
                            Severity.ERROR,
                            "pluginGroups.pluginGroup[" + i + "]",

    """
    caught = []

    @websocket_middleware
    async def catcher(websocket, call_next):
        try:
            return await call_next()
        except Exception as e:  # pragma: no cover
            caught.append(e)
            raise

    myapp = make_app(middleware=[Middleware(catcher)])

    client = TestClient(myapp)
    with pytest.raises(WebSocketDisconnect) as e:

 * shared with the {@code re2j} library. For internal use only. Please refer to the {@code Pattern}
 * javadoc for details.
 */
@GwtCompatible
abstract class CommonPattern {
  public abstract CommonMatcher matcher(CharSequence t);

  public abstract String pattern();

  public abstract int flags();

  // Re-declare this as abstract to force subclasses to override.
  @Override
  public abstract String toString();

                        if (pos < line.length()) {
                            String data = line.substring(pos + 1).trim();
                            if (properyPattern.matcher(key).matches() && data.startsWith(CIPHER_PREFIX)) {
                                data = cipher.decrypt(data.substring(CIPHER_PREFIX.length()));
                            }
                            paramMap.put(key, data);

                    }
                    continue;
                }

                String[] inputs;
                String output;

                final Matcher m = parsePattern.matcher(replacedLine);

                if (!m.find()) {
                    logger.warn("Failed to parse mapping: line={}, path={}", line, path);
                    if (updater != null) {