You are missing that he want's a blanks after the commas.

That's not what he said ("join all the elements by a comma"), and that's not what he's currently doing (print join ",", @z;). Trivial change either way.

I improve (golfwise) to [...] unless eof

Good, but
if !eof is even shorter (6 from 10) and clearer.
if !eof() means something different and might be desirable.

But since capturing a literal regex is silly

I doubt the OP is really matching "d".

In reply to Re^4: Better Way of Manipulating Array Elements by ikegami
in thread Better Way of Manipulating Array Elements by bichonfrise74

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