LineItr lines = new LineItr(Arrays.asList(lineArray).iterator());
        while (lines.hasNext()) {
            Matcher m = START.matcher(lines.next());
            if (m.matches()) {
                checkSnippet(log, max, lines, m.group(1), m.group(2));
            }
        }
    }

                    .findFirst()
                    .orElseThrow(() -> new IOException("Can't find package definition in file " + file));
                Matcher matcher = pattern.matcher(packageLine);
                if (matcher.find()) {
                    return matcher.group(1);
                } else {
                    throw new IOException("Can't extract package name from file " + file);
                }
            }

      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>()

 * 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();

        final Matcher matcher = pattern.matcher(value);
        while (matcher.find()) {
            final String key = matcher.group(2);
            String replacement = System.getProperty(key);
            if (replacement == null) {
                replacement = matcher.group(1);
            }

        Pattern pidPattern = isWindows() ? WINDOWS_PID_PATTERN : UNIX_PID_PATTERN;

        psOutput.forEach(line -> {
            Matcher commandLineArgsMatcher = commandLineArgsPattern.matcher(line);
            Matcher pidMatcher = pidPattern.matcher(line);
            if (commandLineArgsMatcher.find() && pidMatcher.find()) {
                String pid = pidMatcher.group(1);
                if (!MY_PID.equals(pid)) {

            throw new IllegalStateException("Malformed distributionUrl line: " + distributionUrl);
        }
        String url = distributionUrl.substring(idx + 1).trim();

        Matcher m = WRAPPER_VERSION_EXTRACT.matcher(url);
        if (!m.matches()) {
            throw new IllegalStateException("Could not extract wrapper version from distributionUrl: " + url);
        }
        return m.group(1);
    }

    }

    @Override
    public Optional<String> module() {
        return Optional.ofNullable(moduleName);
    }

    @Override
    public PathMatcher matcher(Collection<String> defaultIncludes, boolean useDefaultExcludes) {
        return null; // Not used for this test.
    }

    @Test
    void testDirectory() {

 */
@GwtCompatible
final class Platform {
  private static final PatternCompiler patternCompiler = loadPatternCompiler();

  private Platform() {}

  static CharMatcher precomputeCharMatcher(CharMatcher matcher) {
    return matcher.precomputedInternal();
  }

  static <T extends Enum<T>> Optional<T> getEnumIfPresent(Class<T> enumClass, String value) {
    WeakReference<? extends Enum<?>> ref = Enums.getEnumConstants(enumClass).get(value);

   * https://cs.android.com/android/platform/superproject/+/android-2.3.7_r1:libcore/luni/src/main/java/java/util/regex/Matcher.java;l=550;drc=5850271b4ab93ebc27c1d49169a348c6be3c7f04
   */
  private static MatchResult createMatchResult() {
    Matcher matcher = Pattern.compile(".").matcher("X");
    matcher.find();
    return matcher.toMatchResult();
  }

  private static final ClassToInstanceMap<Object> DEFAULTS =