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my %dict = (
    'brown'      => 'yellow',
    qr/int(\d+)/   => 'int',
    qr/float(\d+)/ => 'float',
);

$VAR1 = {
          '(?-xism:int(\\d+))' => 'int',
          'brown' => 'yellow',
          '(?-xism:float(\\d+))' => 'float'
        };

my %dict = (
    'brown'      => 'yellow',
    'int\(\d+\)'   => 'int',
    'float\(\d+\)' => 'float',
);