Try 

$bar3 =~ s/(.)(?!\z)/$1\t/g;

[download]

i.e. for every character except the last one (-> (?!\z)), replace it with itself plus a tab.

(What your substitution would do is remove a trailing tab.)

In reply to Re: Substitute: for having tabs between the characters by almut
in thread Substitute: for having tabs between the characters by snape

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