my solution:
use strict;
use warnings;
my %replaces =
(
"foo" => {
'W100' => 'W102',
'W101' => 'W103',
},
"bar" => {
'W120' => 'W99',
'W121' => 'W104',
},
);
my $expr = join '|', map {keys %$_} values %replaces;
print $expr;
(similar to ikegami's but DRYer)
There are multiple issues with your code:
- your data structure was buggy since it swaps ( with {
- your my $expr is scoped° to the loop, hence undef outside
- $expr = will be overwritten with each iteration
°) kind of, strict doesn't complain.
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