Fulltext SELECTing only part of a field entry

Hi, Not really sure if this is possible. I am using a fulltext search to search through very large entries. Basically an entry might contain 200,000 words, which are searched for exact matches. What I want to do is SELECT, say, the 300 words surrounding the exact match from the 200,000 word entry and pass it to a PHP script, rather than passing the entire 200,000 words to the script. Am I explaining myself clearly? In other words I want to limit the amount of text SELECTed, so that I am not wasting memory, etc, by passing huge strings to PHP. Is it possible? I've done a lot of looking, but the MySQL documentation is pretty limited on fulltext. If it is possible, can anyone give me a rough idea of how to go about it? The end result would be the sort of contextual search text results that you get in a Google search. Many thanks BMA