You can use the list multiplier.
$
perl -Mstrict -Mwarnings -MData::Dumper -E '
> my @arr = q{a} .. q{j};
> my $low = 2;
> my $high = 5;
> @arr[ $low .. $high ] = ( 2 ) x ( $high - $low + 1 );
> print Data::Dumper->Dumpxs( [ \ @arr ], [ qw{ *arr } ] );'
@arr = (
'a',
'b',
2,
2,
2,
2,
'g',
'h',
'i',
'j'
);
$
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