code: public static URL captureIn(final String param)
     {
        URL path = new URL("{" + param + "}") {
           @Override
           public String toString()
           {
              return "URL.captureIn(\"" + param + "\")";
           }
        };
        return path;
     }
docs: Create a {@link Condition} to capture the entire value of the current {@link Address} into the given
  {@link Parameter} name. This {@link Parameter} may be referenced in other {@link Condition} and {@link Operation}
  instances within the current {@link Rule}.
  
  @see ConfigurationRuleParameterBuilder#where(String)