return patternCompiler.isPcreLike();
  }

  private static PatternCompiler loadPatternCompiler() {
    /*
     * We'd normally use ServiceLoader here, but it hurts Android startup performance. To avoid
     * that, we hardcode the JDK Pattern compiler on Android (and, inadvertently, on App Engine and
     * in Guava, at least for now).
     */
    return new JdkPatternCompiler();
  }

  @GwtIncompatible // regular expressions
  private static
  java.util.regex.Pattern
      fpPattern() {
    /*
     * We use # instead of * for possessive quantifiers. This lets us strip them out when building
     * the regex for RE2 (which doesn't support them) but leave them in when building it for
     * java.util.regex (where we want them in order to avoid catastrophic backtracking).
     */

       * by stripping annotated methods entirely, and if we strip this method, then JUnit would just
       * run the supermethod as usual.
       *
       * TODO: b/292578973: Use @AndroidIncompatible if we change our system to keep the methods in
       * place but to have the test runner skip them. However, note that if we choose to *both*
       * strip the methods *and* have the test runner not run them (for some unusual cases in which

       * by stripping annotated methods entirely, and if we strip this method, then JUnit would just
       * run the supermethod as usual.
       *
       * TODO: b/292578973: Use @AndroidIncompatible if we change our system to keep the methods in
       * place but to have the test runner skip them. However, note that if we choose to *both*
       * strip the methods *and* have the test runner not run them (for some unusual cases in which

                  </fileset>
                </copy>
                <!-- TODO(cpovirk): If we continue stripping these once we use @ElementTypesAreNonnullByDefault, then we should strip @ElementTypesAreNonnullByDefault, too, to reflect that the classes are *not* fully annotated. But hopefully we can stop stripping them, as https://github.com/jspecify/jspecify/issues/184 should make possible. -->