static CommonPattern compilePattern(String pattern) {
    Preconditions.checkNotNull(pattern);
    return patternCompiler.compile(pattern);
  }

  static boolean patternCompilerIsPcreLike() {
    return patternCompiler.isPcreLike();
  }

  private static PatternCompiler loadPatternCompiler() {
    // We want the JDK Pattern compiler:
    // - under Android (where it hurts startup performance)

   */
  @RestrictedApi(
      explanation = "PatternCompiler is an implementation detail of com.google.common.base",
      allowedOnPath = ".*/com/google/common/base/.*")
  boolean isPcreLike();