搜索跨度和位置（Search for spans and positions）

Spans and positions are not implemented. Positions will depend on tokenization.

Anything more detailed than one *(2) two are arbitrarily dependent on the tokenization. An identifier and pattern matching, or dual FTS and ID tokenization, might be the answer in these cases.

term[^] - start
term[$] - end
term[position]

These are of possible use but excluded for now. Lucene surround extensions:

and(terms etc)
99w(terms etc)
97n(terms etc)