Will the "Doing this here..." always be within a <div> tag?
We can use the HTML opener and target the content in the <div> only, as opposed to matching on the entire Body.Text.
Also, do you want to block the entire page if there is a match or simply remove the content inside the <div>?
I do something similar with the HTML opener when i want to remove specific content from a page, but leave the rest of the page intact.
I've attached a set of rules i use for removing certain named <div> elements from a facebook page. you might be able to do something similar.