Your solution is definitely buggy.

Let's say %$ref_cookie contains 

-foo => 'food',
-bar => 'bard'

[download]

The solution you propose would push 

'foo', undef, 'bar', undef
    -or-
'bar', undef, 'foo', undef

(depending on the order the keys are returned)

[download]

That's obviously not what he wants. He would just use undef if so.

Fine, you'll say %$ref_cookie should contain 

-foo => 'food',
foo  => 'fool',
-bar => 'bard',
bar  => 'barl'

[download]

The solution you propose would push 

'foo', 'fool', 'fool', 'bar', 'barl', 'barl'
    -or-
'foo', 'fool', 'fool', 'fool', 'bar', 'barl'
    -or-
undef, undef, 'bar', 'barl', 'foo', 'fool'
    -or-
...

(depending on the order the keys are returned)

[download]

It makes no sense. I suspect the OP wants 

'foo', 'food', 'bar', 'bard'
    -or-
'bar', 'bard', 'foo', 'food'

(depending on the order the keys are returned)

[download]

That is achieved using the solution I proposed.

In reply to Re^5: Inline substitution regex by ikegami
in thread Inline substitution regex by bradcan

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