return pattern.matcher(userCode).matches();
    }

    String getQueryCollapseInnerHitsSorts();

    @SuppressWarnings("rawtypes")
    default OptionalThing<SortBuilder[]> getQueryCollapseInnerHitsSortBuilders() {
        @SuppressWarnings("unchecked")
        OptionalThing<SortBuilder[]> ot = (OptionalThing<SortBuilder[]>) propMap.get(QUERY_COLLAPSE_INNER_HITS_SORTS);
        if (ot == null) {

                    .setSize(fessConfig.getQueryCollapseInnerHitsSizeAsInteger());
            fessConfig.getQueryCollapseInnerHitsSortBuilders()
                    .ifPresent(builders -> stream(builders).of(stream -> stream.forEach(innerHitBuilder::addSort)));
            return new CollapseBuilder(fessConfig.getIndexFieldContentMinhashBits())