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  1. or download this
    my $sender = $1 if /sender=(\S+)/;
  2. or download this
    my $sender;
$sender = $1 if /sender=(\S+)/;
if (defined $sender) { # ...
  3. or download this
    if (/sender=(\S+)/) { 
    my $sender = $1;
    do_something_with_sender();
}