Your desired pattern match goes across multiple lines, so I think you will need a more precise generic definition. This may be a job for the SED address range syntax. The general form is:
sed '/dog/,/cat/s/one/two/1' filename > newfilename
This starts on the first line containing "dog", and ends on the first following line containing "cat". In this range, I replaces the first instance of "one" on each line with "two". It writes the results to "newfilename".
In your example, you use "\r". Is that meant to be a return? If so, you want "\n" (newline) instead. BUT: SED works one line at a time so--in your example---multiple newlines will not be matched.
For more and better help, please post an example of the actual text to be removed.
For a really good SED tutorial, go here: