It looks like you are attempting to validate information passed from form input fields in a CGI script. For this, I would suggest that you might want to look at either HTML::FormValidator or Data::FormValidator - These modules allow for validation of not only the presence of form input fields in the passed CGI parameters, but also the adherence of these fields to allowed formats. For example:

use CGI;
use Data::FormValidator;

my $cgi = CGI->new;
my $validator = Data::FormValidator->new({
    'form_input'    =>  {
        'required'      =>  [ qw/ first second clan nick pass repass e
+mail reemail street postal city country / ],
        'constraints'   =>  {
            'email'         =>  'email',
            'pass'          =>  '/^[\w\d\-\ ]{1,}$/',
            'reemail'       =>  'email',
            'repass'        =>  '/^[\w\d\-\ ]{1,}$/'
        },
        'filters'       =>  [ qw/ trim / ]
    }
});

my %params = map { $_ => $cgi->param($_) } $cgi->param();
my ( $valid, $missing, $invalid, $unknown ) = $validator->validate( \%
+params, 'form_input' );
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This little snippet of code performs a number of tasks:

• Creates a new CGI object, $cgi.


• Creates a new Data::FormValidator object with a input validation profile called 'form_input' - This input validation profile defines the required fields and sets regular expression constraints on some of them (email, pass, reemail and repass) which need to be met for the field to be considered as 'valid'.


• Creates a hash of CGI parameters, indexed by the parameter field name, and,


• Validates the CGI form input fields with the Data::FormValidator validator against the form_input validation profile - This returns four array references containing those fields which are valid, invalid, missing and unknown respectively.