private boolean nextIsLetterOrDigit(MatchTokenStrippingCharacterIterator characters) {
        return characterClasses.isLetterOrDigit(characters.peek());
    }
Converts grams to the original string.

Example (gram size 3): <code>blulue rededs</code> becomes <code>blue reds</code>
container-search/src/main/java/com/yahoo/search/querytransform/NGramSearcher.java