No problem. Of course, you could simplify your entire code down to: 

$buf = "hello\nworld";
$buf =~ s/[^ -~]/./g;
$rhs .= $buf;

[download]

The above alters the value of $buf in the process. Feel tree to make a copy of $buf and work with the copy if you want to preserve $buf's value.

In reply to Re^3: regex incorrectly matching newline by ikegami
in thread regex incorrectly matching newline by bfdi533

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