public static CharMatcher anyOf(CharSequence sequence) {
    switch (sequence.length()) {
      case 0:
        return none();
      case 1:
        return is(sequence.charAt(0));
      case 2:
        return isEither(sequence.charAt(0), sequence.charAt(1));
      default:
        // TODO(lowasser): is it potentially worth just going ahead and building a precomputed
        // matcher?
        return new AnyOf(sequence);
    }

  public static CharMatcher anyOf(CharSequence sequence) {
    switch (sequence.length()) {
      case 0:
        return none();
      case 1:
        return is(sequence.charAt(0));
      case 2:
        return isEither(sequence.charAt(0), sequence.charAt(1));
      default:
        // TODO(lowasser): is it potentially worth just going ahead and building a precomputed
        // matcher?
        return new AnyOf(sequence);
    }

                    boolean active = true;
                    if (!selector.isEmpty()) {
                        if (selector.charAt(0) == '-' || selector.charAt(0) == '!') {
                            active = false;
                            selector = selector.substring(1);
                        } else if (token.charAt(0) == '+') {
                            selector = selector.substring(1);
                        }

            validIds.add(id);
            return true;
        }
    }

    private boolean isValidId(String id) {
        for (int i = 0; i < id.length(); i++) {
            char c = id.charAt(i);
            if (!isValidIdCharacter(c)) {
                return false;
            }
        }
        return true;
    }

    private boolean isValidIdCharacter(char c) {

#     srcs = glob(
#         [
#             "*.bara.sky",
#             "*.dic",
#             "*.ftrcp",
#         ],
#         exclude = [
#             "copy.bara.sky",
#         ],
#     ),
#     visibility = ["//visibility:public"],
# )
#
# filegroup(
#     name = "copybara_config",
#     srcs = ["copy.bara.sky"],
#     data = [
#         ":copybara_library",

            int rn) throws CIFSException {
        if (log.isDebugEnabled()) {
            log.debug("Resolving DFS path " + path);
        }

        if (path.length() >= 2 && path.charAt(0) == '\\' && path.charAt(1) == '\\') {
            throw new SmbException("Path must not start with double slash: " + path);
        }

        try (SmbSessionImpl sess = getSmbSession(ctx, targetHost, targetDomain);

     */
    protected String convertRobotsTxtPatternToRegex(final String path) {
        String newPath = path.replace(".", "\\.").replace("?", "\\?").replace("*", ".*");
        if (newPath.charAt(0) != '/') {
            newPath = ".*" + newPath;
        }
        if (!newPath.endsWith("$") && !newPath.endsWith(".*")) {
            newPath = newPath + ".*";
        }

   * static final ListMultimap<Character, String> FIRST_LETTER_MULTIMAP =
   *     Stream.of("banana", "apple", "carrot", "asparagus", "cherry")
   *         .collect(
   *             toMultimap(
   *                  str -> str.charAt(0),
   *                  str -> str.substring(1),
   *                  MultimapBuilder.treeKeys().arrayListValues()::build));
   *
   * // is equivalent to
   *

   * static final ListMultimap<Character, String> FIRST_LETTER_MULTIMAP =
   *     Stream.of("banana", "apple", "carrot", "asparagus", "cherry")
   *         .collect(
   *             toMultimap(
   *                  str -> str.charAt(0),
   *                  str -> str.substring(1),
   *                  MultimapBuilder.treeKeys().arrayListValues()::build));
   *
   * // is equivalent to
   *

        if (value == null) {
            return "";
        }
        final StringBuilder sb = new StringBuilder(value.length() + 16);
        for (int i = 0; i < value.length(); i++) {
            final char c = value.charAt(i);
            if (c == '\0') {
                continue; // Skip NULL characters
            }
            if (c == '\\' || c == '"') {
                sb.append('\\');
            }
            sb.append(c);