You can't do something repeatedly without some loop.

That doesn't mean that all loops are equal, though. You might be able to use something like 

$line =~ s/(?:\t|\z)\K/a/g;  # Requires 5.10+
$line =~ s/(\t|\z)/${1}a/g;  # Slower, but works with earlier versions

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Update: Accidentally said "with some loop." Fixed.

In reply to Re^3: Concatenation to elements in an array ! by ikegami
in thread Concatenation to elements in an array ! by pspillai

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