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  1. or download this
    my $x = '123'; 
(my $y = $x) =~ s/(2)/$1+1/e;
print $y;
  2. or download this
    my $x = '123'; 
(my $y = $x) =~ tr/2/3/;
print $y
  3. or download this
    my $x = '123'; 
my $y = $x + 10;
print $y