/"$section"/ matches lines that contains a double quote followed by something that the regexp in $section matches followed by another double quote.

If you want to match lines that contain the text in $section, you want
/\Q$section\E/

If you want to match lines that are equal to the text in $section, you want
/^\Q$section\E\z/
or
$_ eq $section

I have no idea what's in $section, so it limits my ability to guess what you are trying to do and the advice I can give.

By the way, I noticed you changed
$_ .= $text;
to
$_ .= $_ .="$newline";
Why did you add quotes?

In reply to Re: Tie::File question by ikegami
in thread Tie::File question by machvvv

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