N-grams are composed of tokens, this is why don’t like is a trigram and will be displayed as do n’t like. (In a concordance, don’t will be displayed without a space but also treated as two tokens.)
The result can be limited by minimum and maximum frequency. By default, low-frequency n-grams are excluded. Use the advanced tab to change this.
Regular expressions can be used to define complex criteria for the n-grams that should be included in the frequency list. When using regular expressions, the whole n-gram is treated as one continuous sequence of characters which also includes spaces.
There are two versions of the starting, ending and containing filters. One for filtering by characters (letters) appearing anywhere inside an n-gram and one for filtering by complete words, i.e. what is found between two spaces.