Hi fellow monks,
I'm looking for a solution to join together all the second-level keys from a hash constructed like that :
%replaces =
{ "foo"
=> ( 'W100' => 'W102',
'W101' => 'W103',
...),
"bar"
=> ( 'W120' => 'W99',
'W121' => 'W104',
...),
... }
For instance, the hash shown below should led to the string
W100|W101|W120|W121.
Would it be possible to find a one-liner expression, or at least, a graceful piece of code to perform this ?
I tried this :
my $expr = join '|', keys(%{$replaces{$_}}) foreach keys(%replaces);
But
$expr remains undefined after this line.
I ended up hardcoding the expecting first-level values for the current run, but it's a dirty solution :
my $expr = join '|', (keys(%{$replaces{'foo'}}), keys(%{$replaces{'bar'}}));
Thanks for any help on that !