Yii2 url routing to get string parameter

I have a url like this

http: // localhost / yii2 / category / my-custom-string-parameter

I need to get the text my-custom-string-parameter

And I set up rules like this

'urlManager' => [
            'class' => 'yii\web\UrlManager',
            'showScriptName' => false,
            'enablePrettyUrl' => true,
            'rules' => array(
                    '<controller:\w+>/<id:\d+>' => '<controller>/view',
                    '<controller:\w+>/<action:\w+>/<id:\d+>' => '<controller>/<action>',
                    '<controller:\w+>/<action:\w+>' => '<controller>/<action>',
                    'category/<url:>' => 'category/view',
            ),
        ],

      

        
        
        
      

    

It always gives me a 404 error. What should I do?