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Underscore between variables - 10 years ago

Hello, I'm trying to rewrite URL with parameters x, y, z to filename by such template: file_{x}_{y}_{z}.txt location /path { rewrite ^ /path/file_$arg_x_$arg_y_$arg_z.txt break; root /var/www; } But it is not working. Because nginx tries to use variables x_, y_. How can I use underscore symbol to separate variables? In bash there is curly brackets style for such cases: