[DiapDealer]

Highlight the block of text in Code View
Right-click the highlight and choose "Mark Selected Text"
(Note the criteria in F&R changes to "Marked Text")
Right-click and select "Unmark Marked Text" when done (block unhighlighted)

EDIT: sorry, my mistake. I forgot that the new Marked Text feature is a text-only search (no html tags or attributes are included).