How to create a rule that tests the raw html when encoded in base64, but which ignores line breaks?

[Mark London]

Hi - I created a FULL rule that works fine with html in plain text.  
However, if the html is base64 encoded, FULL rules don't appear to 
work.  A RAWBODY rule doesn't work either, because it doesn't ignore 
line breaks.  Any ideas?  Thanks. - Mark