[runningdogx]

With a modern pcre library version and nginx, instead of

    location ~ ^/([a-zA-Z0-9_]+)/ {
      set $username $1;

you can use named captures

    location ~ ^/(?<username>[a-zA-Z0-9_]+)/ {

[newman314]

Newer versions of pcre and nginx also include the ability to use the pcrejit which provides a nice speedup for regex.

[transmit101]

Thanks. I didn't know that. I did strip out a lot of the more advanced/ambiguous Nginx config for clarity though.