Consider using a prompt module.
(Untested)
use strict;
use warnings;
use IO::Prompt::Hooked;
my %options = (
message => 'Enter Pattern> ',
validate => sub {eval {qr /$_[0]/}; return $@},
error => "Invalid Pattern\n",
escape => qr/^\s*$/,
);
my $dir = '/etc';
while (my $pattern = prompt %options) {
my @matched = grep { /$pattern/ } glob "$dir/*";
do{ local $, = "\n"; print "@matched\n";};
}
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