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  1. or download this
    my $value_0;
my $value_1 = 'i have a defined value';
...
$value_0=~/content/; # this will complain
$value_1=~/content/; # won't complain
$value_2=~/content/; # won't complain
  2. or download this
    if ( defined $value_0 and $value_0=~/content/ ){
   ...