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if (grep {$_ eq $zero_arg} @ARRAY) and not grep {$_ eq $sec_arg} @anot
+herarray){
  doSomething();
}

for my $Str ($zero_arg, $sec_arg){
  die "$Str is not in routers.txt" unless grep {$_ eq $Str} @Routers;
...
    # so do something
  }
}

for my $Str ($zero_arg, $sec_arg){
  die "$Str is not in routers.txt" unless grep {$_ eq $Str} @Routers;
...
  # They are both there
  # So do something
}