http://l3tczdiiwoo63iwxty4lhs6p7eaxop5micbn7vbliydgv63x5zrrrfyd.onion/4.0.0/user-manual/filter-file.html
Remember the parts of the script from (and including) the start tag up to
(and excluding) the string "document.referrer" as $1 , and the
part following that string, up to and including the closing tag, as $2 . Now the pattern is deciphered, but wasn't this about substituting things? So lets look at the substitute: $1"Not Your Business!"$2 is easy to read: The text remembered as $1 , followed by "Not Your Business!"