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perl -e'use Data::Dumper; %hash=("BLAH01-A05AFGH0"=>17); for(keys %hash) { if (m/(BLAH\d{2}-\w)/) { $hash{$1} = delete $hash{$_} } }; print Dumper \%hash'

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$VAR1 = {
          'BLAH01-A' => 17
        };