code: public static boolean isDynamicScriptExpression(String language, String value) {
      return StringUtil.isExpression(value) && (language != null && !JuelScriptEngineFactory.names.contains(language.toLowerCase()));
    }
docs: Checks if the value is an expression for a dynamic script source or resource.
  
  @param language the language of the script
  @param value the value to check
  @return true if the value is an expression for a dynamic script source/resource, otherwise false