code: protected Object resolveSimpleString(String exp, Map<String, ? extends Object> contextMap, LaContainer container, Class<?> resultType) {
          if (exp.startsWith(DQ) && exp.endsWith(DQ) && exp.length() > DQ.length()) {
              final String unquoted = exp.substring(DQ.length(), exp.length() - DQ.length());
              if (!unquoted.contains(DQ)) { // simple string e.g. "sea"
                  return unquoted;
              }
          }
          return null;
      }
docs: ==============