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regex to find words in ALL CAPITAL letters

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I've been looking for a search that will return all books in my library that have at least one work that is in all capital letters. My current iteration of this is
Code:

title:"~\w[A-Z]+(?:\s+[A-Z]+)*\w"
. I have also tried
Code:

title:"~[A-Z\s]+"
and
Code:

title:"~m/^[^a-z]*$/"
.

None of these are returning what I expect. Can someone help me figure otu what I'm doing wrong?

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