@RonMahoney
I'm not quite clear on what your question is. You can swap out the colon with any of a number of characters, including the tilde (~) or an underscore (_), for example, but you'd be doing that in the actual tracking code that gets included in your links/URLs. Then, in the Classification Rule Builder, you'd update your regex to look for the new/alternate delimiter (~, _, etc) instead of the colon.
Perhaps if you can provide more context, someone here can provide more specific, helpful guidance.