Align on : but not on ::

[kankaristo]

I'd like to be able to align on : in something like CSON, but not on :: in the case of C++ namespaces.

I've currently disabled aligning on : since I work more in C++ than CoffeeScript or similar, but having it would be nice (although https://github.com/Freyskeyd/atom-alignment/issues/48 is also a bit of a blocker).

Could there be an override list?

Or maybe regex support for "Align By"? Then you could do something like [^:](:)[^:] to match : but never ::.