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my $string = 'foo: $foo and bar: $bar\n';
print $string, "\n";
...
my $bar = "barzleberry foo";

print eval 'qq(' . $string . ')';

my %vars = (
    foo => 'foozleberry pie',
...
my $string = 'foo: $foo and bar: $bar'; 
$string =~ s/\$(\w+)/$vars{$1}/g; 
print $string, "\n";