Tricky nginx redirect rules with folders and subfolders

Question

I want to achieve a 301 redirect like this with nginx:

https://www.example.com/foo1/bar1 -> https://www.example.com/foo2/bar2 
https://www.example.com/foo1/bar3 -> https://www.example.com/foo2/bar4 
https://www.example.com/foo1/whatever -> https://www.example.com/foo2/whatever 
https://www.example.com/foo1?argumet -> https://www.example.com/foo2?argument 

In order to try and acomplish this I am trying to use:

#Redirect the longest forced links first
location ~ ^/foo1/bar1 {
    return 301 https://www.example.com/foo2/bar2;
    break;
}
location ~ ^/foo1/bar3 {
    return 301 https://www.example.com/foo2/bar4;
    break;
}
#Redirect everything else except for the matches above according to the rule
location ~ ^/foo1(?:/(.*))?$ {
    return 301 https://www.example.com/foo2/$1$is_args$args;
}

It is all good for the first 3 situations. However, for the last situation, I am getting a redirect to:

https://www.example.com/foo2/?argument

instead of

https://www.example.com/foo2?argument

...and it breaks the logic of the site.

Can you please help me get this right? Thanks!

Answer 1

Try:

location ~ ^/foo1(/.*)?$ {
    return 301 /foo2$1$is_args$args;
}