Expression looks fine to me. When you hit the test button, what it should do is highlight in yellow all the places it found a match. So if you scroll the window to where you know it should find a match then you should see it turn yellow instantly when you click Test.
If you mean it does nothing in the epub output, make sure you remembered to actually tick the "Remove headers" checkbox itself, not just set the regular expression. I have made that mistake a few times...
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