#!/usr/bin/perl
use strict;

my (@gerbal) = (
		'Nawbie', 
		'Nbwbie', 
		'Newbie', 
		'Niwbie',
		'Niwbee',
		'Nmwbie',
		'Nowbie',
		'Nuwbie',
	);

foreach my $foot (@gerbal) {
	print "$foot -- ";
	if ($foot =~ /N[aeiou]wbie/) {
		print " match found.\n";
	} else {
		print " no match.\n";
	}
}
exit;

Results:

Nawbie --  match found.
Nbwbie --  no match.
Newbie --  match found.
Niwbie --  match found.
Niwbee --  no match.
Nmwbie --  no match.
Nowbie --  match found.
Nuwbie --  match found.