Parameter checking

[columb]

I'm using Getopts::Std to parse command line parameters. The -n flag needs to take a numeric value. The relevant bits of code are

my %opts;
getopts 'lfh:?tm:n:', \%opts or print_usage;
defined $opts{'?'} and print_usage;

( defined $opts{'n'} ) && ( ! $opts{'n'} =~ /^\d+$/ ) and print_usage;

Firstly, why doesn't this work? And secondly, there must be a better check for $opts{'n'} being numeric. All suggestions welcome.

Thanks

Ceci n'est pas une signature
Columb Healy

 

[Kirsle]

($opts{'n'} !~ /[0-9]/)

"$opts{n} doesn't contain numbers