Here's the modified code for others reference:
use String::Interpolate qw( interpolate );
...[snip]...
# Method 4: worked! (not global)
#my ($before, $after) = $regex =~ m{/(.*)/(.*)/};
#$filename = replace($filename, $before, sub {interpolate($after)},0);
# Method 5: worked! (global)
my ($before, $after) = $regex =~ m{/(.*)/(.*)/};
$filename = replace($filename, $before, sub {interpolate($after)},1);
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