May I know, How I can add a new line char with the line I am adding, like 
if (/foo/) {
    $_ = "This is now bar\n";
}

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I tried the above, but is not adding a new line, I tried to set autochomp => 0 also.

In reply to Re^2: match a line and edit it by Anonymous Monk
in thread match a line and edit it by Anonymous Monk

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