驗證問題的CakePHP

Question

我正在與CakePHP用戶註冊合法化的做法，但我得到一些錯誤，從核心：

Warning (2): preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash [CORE/cake/libs/model/model.php, line 2611] 

這是驗證數組：

var $validate = array (
    'username' => array (
     'ruleUser1'=> array (
      'rule' => 'alphaNumberic', 
      'message' => 'The username must be alphanumeric only' 
     ), 
     'ruleUser2' => array (
      'rule' => 'notEmpty', 
      'message' => 'Username can\'t be empty' 
     ), 
     'ruleUser3' => array (
      'rule' => 'isUnique', 
      'message' => 'This username has already been taken.' 
     ) 
    ), 
    'password' => array (
     'rulePass1'=> array (
      'rule' => array ('minLength', 8), 
      'message' => 'Password must be 8 character length' 
     ), 
     'rulePass2' => array (
      'rule' => 'notEmpty', 
      'message' => 'Password can\'t be empty' 
     ) 
    ) 
); 

在那裏我錯誤？

Answer 1

'username' => array (
    'ruleUser1'=> array (
     'rule' => 'alphaNumberic', 
     'message' => 'The username must be alphanumeric only' 
    ), 

alphaNumberic應該字母數字。我認爲這是問題的根源？