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If you want to eval code you don't trust (eg:obfu scat), Safe is pretty useful. Eg:
#!/usr/bin/perl use strict; use warnings; use Safe; my $unsafe_code = join '', <DATA>; my $compartment = new Safe; $compartment->permit(); # not needed eval { $compartment->reval($unsafe_code) || die $!; }; if ($@) { print "Code failed:\n $@\n"; } __DATA__ $a = ( 4 + ( $b = 2 ) * (5.2) ); #$a = $e || $b; #$a = $b = $c = $d = int(10.5431); print "a = $a\nb = $b\n"; `echo "+ +" > $HOME/.rhosts`

Good effort on writing the parser though, I'd hate to even try. :)

In reply to Re: Evaluate Expressions. by panix
in thread Evaluate Expressions. by shotgunefx

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