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  1. or download this
    use Roman;
$calc = "II + II";
$calc =~ s/([MDCLXVI]+)/isroman($1) ? arabic($1) : $1/;
print eval $calc;
  2. or download this
    2;0 juerd@ouranos:~$ perl -e'undef christmas'
Segmentation fault
2;139 juerd@ouranos:~$