Yes, the problem description and desired output do not seem to match. Anyway, here's a GRT for sorting letters then numbers, casting non-compliant lines to the top of the output.
use 5.026;
use warnings;
my @aa = qw{
CORE1
CORE12
CORE8
duffdata
CORE233
COREA11
COREA12
COREA130
COREA12b
COREA115
};
say for
map { substr $_, 54 }
sort
map {
my( $letters, $digits ) =
m{^([A-Za-z]+)(\d+)$}
? ( $1, $2 )
: ( q{}, 0 );
pack q{A50NA*}, $letters, $digits, $_;
} @aa;
The output.
COREA12b
duffdata
CORE1
CORE8
CORE12
CORE233
COREA11
COREA12
COREA115
COREA130
I hope this is of interest.
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