Java布尔值问题

Question

private static final Pattern namePattern = 
    Pattern.compile("[a-zA-Z0-9_-]{3,12}");

if (player.getName().length() < 3 || 
        player.getName().length() > 12 || 
        namePattern.matcher(player.getName()).matches()) {
    player.ban("[Autoban] Character-name PE", true);
    return;
}

The code is kinda obvious, I hope

If the players name is longer than 12 or shorter then 3, or have any symbols that shouldnt be ia name = BAM, ban!

but even thought my player name is like Chaos or test, it gets autobanned by this code. idk if the namepattern Pattern blocks characters aswell, I just it to block symbols like "!#&%¤/&%(/)(/(=)$@£$@£{€@£ yeh... What am I doing wrong :(?

Answer 1

I think you meant (!namePattern.matcher(player.getName()).matches()) .

Also, you could've use only the regex match: [a-zA-Z0-9_-]{3,12} since it checks for length.

Edit:

You can use such a function

public void banIfNeeded(Player player)
{
    Pattern namePattern = Pattern.compile("[a-zA-Z0-9_-]{3,12}");
    if(!namePattern.matcher(player.getName()).matches()) {
        System.out.print("Banned"); 
        // Ban somehow
    }
}

As @bkail commented (thanks!), there's no need for the ^ and \\z so I removed them :)