++Marshall for the post, but
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since an 'acc' value like '239876A' seems possible (per the OPed example), a string comparison should be used; and
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the OPed example wants records added to the output array if a particular key does not have a certain value, so ne should be used, e.g.,
push @$all, $href if $href->{acc} ne '44443';
(untested).
Give a man a fish: <%-{-{-{-<
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