How to address all pages to one route in Yii2 in UrlManager?

Question

Yii

There is a design that redirects any page in the root to site/index, but how to do this for any nesting?
PS it is advisable to leave enablePrettyUrl enabled.
PPS: what does the \w+ parameter do?

'urlManager' => [
            'class' => 'yii\web\UrlManager',
            'showScriptName' => false,
            'enablePrettyUrl' => true,
            'rules' => [
                '<alias:\w+>' => 'site/index',
            ],
        ],

Answer 1

'<url:(.*)>' => 'site/index',
\w+ is a regular expression string. w - Matches any alphanumeric character from the basic Latin alphabet, including the underscore character. Equivalent to the character set [A-Za-z0-9_]. The + symbol means one or more characters from the set [A-Za-z0-9_]
It is useful to read about named parameters