How to complex switch?

[Matthew Ong]

== Quote from dennis luehring (dl.soluz at gmx.net)'s article
> Am 12.05.2011 14:58, schrieb Matthew Ong:

> did you see the string mixin feature before?
> http://www.digitalmars.com/d/2.0/mixin.html
> no outer (parsing) generator needed anymore (with small exceptions) :)

I fail to see what is being addressed here in relation to switch.
What you have shown me is about Regexp and Mixin.
Is mixin related to code generations or switch or...?
Is there a way for you to show some sample code that demo what you wants to say?