In a past post: http://sferich888.blogspot.com/2017/01/learning-using-jsonpath-with-openshift.html
I discussed what json path could do. Today I learned that filters (are only capable of doing simple comparisons (==, !=, <=, >=) type operations.
The tl;dr version is (see regex):
https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/client-go/util/jsonpath/parser.go#L338
However because Kubernetes (and by proxy OpenShift) use the jsonpath extension from exponent-io and the golang re2 (regex engine).
The above "filter" operation to find and compare parts of the path are only (as of right now) capable of simple operations.
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