public abstract boolean matches(char c);

  // Non-static factories

  /** Returns a matcher that matches any character not matched by this matcher. */
  // @Override under Java 8 but not under Java 7
  public CharMatcher negate() {
    return new Negated(this);
  }

  /**
   * Returns a matcher that matches any character matched by both this matcher and {@code other}.
   */

            final Matcher matcher = pattern.matcher(v.trim());
            if (matcher.matches()) {
                final PrunedTag tag = new PrunedTag(matcher.group(1));
                if (matcher.group(2) != null) {
                    final String attrPair = matcher.group(2).substring(1, matcher.group(2).length() - 1);

  }

  private static final class JdkMatcher extends CommonMatcher {
    final Matcher matcher;

    JdkMatcher(Matcher matcher) {
      this.matcher = Preconditions.checkNotNull(matcher);
    }

    @Override
    public boolean matches() {
      return matcher.matches();
    }

    @Override
    public boolean find() {
      return matcher.find();
    }

    @Override
    public boolean find(int index) {

    public boolean isSnapshot(String version) {
        return checkSnapshot(version);
    }

    public static boolean checkSnapshot(String version) {
        return version.endsWith(SNAPSHOT) || SNAPSHOT_TIMESTAMP.matcher(version).matches();
    }

    @Override
    public VersionConstraint parseVersionConstraint(String constraint) {
        requireNonNull(constraint, "constraint");

        return a -> matches(artifact.getGroupId(), a.getGroupId())
                && matches(artifact.getArtifactId(), a.getArtifactId())
                && matches(artifact.getBaseVersion(), a.getBaseVersion())
                && matches(artifact.getExtension(), a.getExtension())
                && matches(artifact.getClassifier(), a.getClassifier());
    }

                return null;
            }
            final Matcher matcher = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE).matcher(value);
            final StringBuffer buf = new StringBuffer(value.length() + 100);
            while (matcher.find()) {
                matcher.appendReplacement(buf, Matcher.quoteReplacement(highlightTagPre + matcher.group(0) + highlightTagPost));
            }

            @Override
            public int size() {
                return (int) properties.entrySet().stream()
                        .filter(PropertiesAsMap::matches)
                        .count();
            }
        };
    }

    private static boolean matches(Entry<Object, Object> entry) {
        return entry.getKey() instanceof String && entry.getValue() instanceof String;
    }

        final List<Artifact> list = new ArrayList<>();
        final String repoContent = getRepositoryContent(url);
        final Matcher matcher = Pattern.compile("href=\"[^\"]*(" + artifactType.getId() + "[a-zA-Z0-9\\-]+)/?\"").matcher(repoContent);
        while (matcher.find()) {
            final String name = matcher.group(1);
            final String pluginUrl = url + (url.endsWith("/") ? name + "/" : "/" + name + "/");
            try {

     * Determines if the OS on which Maven is executing matches the
     * given OS family.
     *
     * @param family the family to check for
     * @return true if the OS matches
     *
     */
    public static boolean isFamily(String family) {
        return isFamily(family, OS_NAME);
    }

    /**
     * Determines if the OS on which Maven is executing matches the
     * given OS family derived from the given OS name

        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)) {