Location regex + if + basic auth to restrict directory access (no replies)

Hello,

I am using basic auth + $remote_user variable send to the back-end
application to change context depending on the logged-in user.

The thing is, even if the page rendered by the back-end uses nginx user
authentication, resources from a directory are still allowed for everyone.

My 'documents' directory is sorted as follows:
documents/
abc/ --> stores content for user 'abc'
def/ --> stores content for user 'def'
...

I tried the following:
location ^~ /documents/(\w+) {
if ($1 != $remote_user) {
return 503;
}
}

But Nginx refuses to validate configuration:
nginx: [emerg] unknown "1" variable
nginx: configuration file /etc/nginx/nginx.conf test failed

Does the 'if' directive have an environment isolated for the on of the
'location' directive?
Am I using wrong syntax?
Is there a 'IfIsEvil' case corresponding to my needs to avoid the use of
the 'if' directive?

Thanks,
---
*B. R.*
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