public boolean supportsExtendedHexCharacter(@Nullable RegExpChar regExpChar) {
    final RegExpLanguageHost host = findRegExpHost(regExpChar);
    try {
      return host == null || host.supportsExtendedHexCharacter(regExpChar);
    } catch (AbstractMethodError e) {
      // supportsExtendedHexCharacter not present
      return false;
    }
  }
public boolean supportsExtendedHexCharacter(@Nullable RegExpChar regExpChar)