#!/usr/bin/perl
use strict;
use warnings;

my $orig="she sells sea shells down by the seashore\n";
my ($new1, $new2) = ($orig, $orig);

my %translate=(she=>'shore', shore=>'sell', sell=>'she');
$new1 =~ s/$_/$translate{$_}/g for keys %translate;
print $new1;
#print join(", ", keys %translate), "\n";

my $FOO='0000';
$translate{$_}=9999-$_ for 1..10;

$new2 =~ s/$_/$translate{$_}/g for keys %translate;
print $new2;
#print join(", ", keys %translate), "\n";

$ perl x.pl
she shes sea shells down by the seashe
shore shores sea shorells down by the seashore