JSON/HTML/XML/Yaml/ssh keys often have nothing useful on a given line, but people still want to ignore a hunk.
I don't have a particular plan for how to handle this. I don't think I'll implement it in the
patterns.txt file as the way I've implemented patterns isn't really compatible w/ such an extension.
I'm mostly concerned about having to run a regular expression against a very large file as a single string.
Offhand, the easiest implementation I can imagine that doesn't force this is to have "begin" and "end" tags, requiring that begin/end tags fit on a single line.