Regex MATCH, but does not work in Everything

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It works 100% perfectly in another on the tool, but does not work in Everything.

Partition Letter
[E-Z]:\\AB\s

[void]

[E-Z]:\\AB\s is working for me, could you please give some more information instead of does not work, as it doesn't help anyone.

With regex enabled from the search menu, the search:
[E-Z]:\\AB\s
Should match:
E:\AB 123

[E-Z] matches letters E to Z
\\ matches a single \
\s matches a space.

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