i am trying to loop over a a cfm file which has lot of data inside it, want to extract all the links which starts with <script src=", i did with javascript but how with CF, i just need a start to understand

you mentioned a lot of data and doing so using javascript, to me this might imply you're talking about post render ? in which case perhaps you should be looking through the data that populates the cfm rather than the generated cfm content ? Sometimes people confuse generated content in the browser with whats going on server side. Anyway, probably not a problem specific to Lucee.