Yii2-匹配模式工作不正常

我有一个名为 imsi 这是一个 string 我只想在其中添加数字

[['imsi'], 'match','pattern'=> '[0-9]','message'=>'IMSI must include only numbers'],

现在,当我尝试创建新记录并插入 imsi公司 无论有无数字,它都会给我错误信息。

我的型号是

 public function rules()
{
    return [
        [['imsi','operator_name','data_details','sms_details','status'], 'required'],
        [['created_by', 'updated_by', 'sim_stauts', 'issued_to', 'returned_by', 'historic','data_details'
            ,'sms_details','monthly_bill','bill_date','credit_limit'], 'integer'],
        [['created_at', 'updated_at','returned_at'], 'safe'],
        [['imsi'], 'match','pattern'=> '[0-9]','message'=>'IMSI must include only numbers'],
        [['operator_name'], 'string', 'max' => 20],
        [['sim_number', 'status','plan_name','imsi'], 'string', 'max' => 50],
        //[['monthly_bill'], 'string', 'max' => 100],
        //[['imsi'], 'unique'],
        [['created_by'], 'exist', 'skipOnError' => true, 'targetClass' => User::className(), 'targetAttribute' => ['created_by' => 'id']],
    ];
}

我怎样才能完全匹配该模式?

任何帮助都将不胜感激。