use strict;
use warnings;

my @nums =(
    '123-456-789',
    '123.789.456',
    '963 456 741',
    '123-456.789',
    '123 789-456',
    '963.456 741',
    '123456789',
    '123-456'
);

for my $num (@nums) {
    print "$num ";
    $num =~ s/[0-9]//g;
    if ($num =~ m/^([-. ])\1*$|^$/) {
        print "matches \n";
    } else {
        print "does not match \n";
    }
}