The natural representation

If not from an external source, string is not the natural representation...
```
my $search = 'foo(.*?)bar';
my $replace = 'wibble$1wobble';
```

Should really be

my $search = qr/foo(.*?)bar/;
my $replace = sub{ "wibble$1wobble" };

s/$search/&$replace/eg;

Or maybe even

my $search_and_replace = sub {
   s/foo(.*?)bar/wibble$1wobble/;
};

&$search_and_replace;