public static String extractString(String stringLiteral)
  {
    return StringEscapeUtils.unescapeJson(stringLiteral.substring(1, stringLiteral.length() - 1));
  }
@Test
  public void testExtractString()
  {
    String extracted = PdlParseUtils.extractString("\"A string with escape chars: \\n\\t\\f\"");
    assertEquals(extracted, "A string with escape chars: \n\t\f");
  }