如何在Nginx上重写@ sign？

server {
    listen 80;
    server_name example.com;

    location / {
        if ($request_uri ~* "^/@") {
            rewrite ^(.*)$ /index.php?$1 last;
        }
    }

    location ~ \.php$ {
        # 配置PHP解析
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}