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my $string = ... from db ...;
my $jscode = $string;
$jscode =~ s/(\W)/ '" + chr(' . ord($1) . ') + "' /ge;
$jscode =~ s/ \+ ""//g;
$jscode = qq{"$jscode"};

"line1" + chr(13) + "line2" + chr(13)

"line1\nline2\n"