Filter for words with initial cap, except Z (ignoring segment start)

Can anyone help me to filter for segments that contain a word that has any initial uppercase letter except for Z, and ignoring the first letter of the segment?

I've asked chatgpt and Gemini and neither came up with a solution that worked, even though I gave it prompts specifying the NET flavour and that ^ means the start of a segment.

Example segments that the regex should be identify:
Experience in Clinical Trials
In the general US population. 

but not Using Zeclan in infants

Thank you!

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