@Override
        boolean serialize(StringBuilder destination, RegExpItem regexp) {
            String annotations = leafAnnotations(regexp);
            destination.append(normalizeIndexName(regexp.getIndexName())).append(" matches ");
            annotatedTerm(destination, regexp, annotations);
            return false;
        }
Serialize Vespa query trees to YQL+ strings.

@author Steinar Knutsen
container-search/src/main/java/com/yahoo/search/yql/VespaSerializer.java