With the commercialization of 5 G

short messages will be replaced by 5 G messages. The length of a single 5 G message text message will reach tens of thousands of words. Existing keyword combination strategies will cause mismatches due to the increase in text length. This paper designs a keyword combination strategy that constrains the context interval. And gives a detailed implementation method. Using this method can effi ciently achieve keyword combination strategy matching in a specifi c length context interval. At the same time

this method can intercept the key text fragments of the hit strategy and help manual reviewers to conduct quick review.