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use POSIX 'strftime';

my $today = strftime '%d/%m/%Y %H:%M', localtime;
$today =~ s!(\d{2})/(\d{2})/(\d{4})!$3-$2-$1!;

my @array = ('One', 'Two', 'Three', 'Four', 'Five');

...

print get_element_index('Four', @array); # Res: 3
print get_element_index('Six', @array); # Res: -1

use constant TEST => 'test';

...

if($var =~ qr{${\TEST}}) { print 'OK!' }
else { print 'Not matched!' }

my $var = 1;

if($var =~ qr{#{\C->TEST_CONST}}) { print 'OK!' }
else { print 'Not matched!' }

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my @array = (2) x 10;

__DATA__

[2,2,2,2,2,2,2,2,2,2]