sqlish queries for cache invalidation?

[Alexandros Kechagias]

Hi Experts,
I am looking for a way to invalidate a cache based on a set of different
"keys" that can be combined with each other with operators like "AND", "OR"
or "NOT".

So I am looking for something that basically behaves like the xkey mod from
varnish-modules[1] with the only difference that it can invalidate cache
objects in an SQLish way.

For example:
xkey.NewPurge("userfoo OR projectbar AND NOT instancebaz")

Do you know a way i could do that in varnish? I am capable of programming
and writing VCL.

[1]
https://github.com/varnish/varnish-modules/blob/master/src/vmod_xkey.vcc

Thanks for your time
Alexandros
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