allowedOnPath = ".*/com/google/common/base/.*")
  CommonPattern compile(String pattern);

  /**
   * Returns {@code true} if the regex implementation behaves like Perl -- notably, by supporting
   * possessive quantifiers but also being susceptible to catastrophic backtracking.
   */
  @RestrictedApi(
      explanation = "PatternCompiler is an implementation detail of com.google.common.base",

      allowedOnPath = ".*/com/google/common/base/.*")
  CommonPattern compile(String pattern);

  /**
   * Returns {@code true} if the regex implementation behaves like Perl -- notably, by supporting
   * possessive quantifiers but also being susceptible to catastrophic backtracking.
   */
  @RestrictedApi(
      explanation = "PatternCompiler is an implementation detail of com.google.common.base",

    /** The key of the message: OCaml */
    public static final String LABELS_facet_filetype_ocaml = "{labels.facet_filetype_ocaml}";

    /** The key of the message: Perl */
    public static final String LABELS_facet_filetype_perl = "{labels.facet_filetype_perl}";

    /** The key of the message: PHP */
    public static final String LABELS_facet_filetype_php = "{labels.facet_filetype_php}";