After clicking on submit Perl now starts to execute the contents of the textarea
I cannot reproduce the problem. If I run your script, HTML in the textarea is interpreted by the browser, but Perl commands are not run. To prevent the contents from evaluation, just replace all & to &amp;, and all < to &lt;. 
    $text =~ s/&/&amp;/g;
    $text =~ s/</&lt;/g;

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: [Perl-CGI] Print non-interpolated string by choroba
in thread [Perl-CGI] Print non-interpolated string by Digioso

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