I believe this is answered on this site, but consider just replacing lengthy chunks with that chunk plus a newline character. Or <br /> tags if this is html. 

  $string =~ s/([^\n]{80})/$1\n/mg;

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In reply to Re: Forcing a string with no spaces to wrap to fit on the screen by pbeckingham
in thread Forcing a string with no spaces to wrap to fit on the screen by Anonymous Monk

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