Bruce Ferrell <bferr...@baywinds.org> wrote:
> if ( ! defined $username || ! $username =~ /[0-9]{10,11}/ ) {
>
> do something;
>
> } else {
>
> do something else;
>
> }
>
> what that's supposed to do is this:
> if it's blank or not 10 or 11 digits...
>
> The question is where is my understanding faulty or did I mess up.
defined() is true if the checked variable has been assigned any value except
undef, so defined $username will be true for an empty username, too.
In any case I'd probably rather write your code like this:
$username ||= ''; # make sure it's always defined
unless( $username =~ m/^\d{10,11}$/ ){
# bad username
} else {
# good username
}
HTH,
Thomas
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