code: public static RequestParameter captureValue(final String name)
     {
        return new RequestParameter(name, "{" + name + "}") {
  
           @Override
           public String toString()
           {
              return "RequestParameter.captureValue(\"" + name + "\")";
           }
  
           @Override
           public boolean evaluateHttp(HttpServletRewrite event, EvaluationContext context)
           {
              super.evaluateHttp(event, context);
              return true;
           }
  
        };
     }
docs: Creates a {@link RequestParameter} condition that will capture the value of the the given request parameter if it
  exists so you can bind to it using <code>.where()</code>.
  
  @param name The name of the request parameter