how to boost query term after tokenizer

[曹霖]

if the query word is "ABCD",then after being tokenized it is "A" "BC" "D" ,
l want to boost term "BC" ,so the query word is like this: "A BC^10 D" and
phrase query "ABCD" . all query words users typing in will be processed
like that automaticly.
l guess l can custom a filter to do it ,but l don't know if it is
feasible,or is there
some other methods,could someone help me,thanks a lot