Unclear: delete from "i want...\n" or from the word after "here" to the newline or something else?

In any case, this appears (so far, anyway) to be a problem that could be tackled with a regular expression, so you may find your answer in perldoc perlretut or perldoc perlre either of which will teach you far more than you'll learn from being given a template for the necessary code.

You may find some information about the Monastery and its norms helpful, too; please see On asking for help, How do I post a question effectively?, and I know what I mean. Why don't you?.