Seems like you just need to look at the first 1-2 character(s).

my @string = ('1. for future assistance ...','* You can also ...','Pag
+e 2,','12345');

foreach my $string (@string){
    if(($string !~ /(^[0-9]\.)|(^[*])|(^[A-Za-z])/)){
        print "$string\n";
    }
}
#OUTPUT
#12345
[download]