use strict;
use warnings;
my %legalReplacements = (name=>'Joe', age=>42);
my $text = q(Hi I'm $name and happen to be $age. You can call me $nam
+e, if you tell me your $ARGV.);
my $regex = qr/\$([a-zA-Z]+)/;
while ($text =~ /$regex/)
{
if (not exists $legalReplacements{$1})
{
warn "INTRUDER ALERT: attempting access to '$1'";
last;
}
$text =~ s/$regex/$legalReplacements{$1}/;
}
print "Final text:\n";
print $text;
gives
C:\>perl Test.pl
INTRUDER ALERT: attempting access to 'ARGV' at test.pl line 13.
Final text:
Hi I'm Joe and happen to be 42. You can call me Joe, if you tell me y
+our $ARGV.
C:\>_
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