I'm not able to get either one of these to work. I just upgraded to nginx 1.0.12 just to make sure my version wasn't an issue. I also checked my PCRE version.

# pcretest
PCRE version 6.6 06-Feb-2006

Here are the errors I'm getting with each example:

Example 1
-----------------------------------------------
server {
listen 80;
server_name ~^www\.(?<domain>.+)$;
rewrite ^ $scheme://$domain$request_uri? permanent;
}

## Error:
[emerg] pcre_compile() failed: unrecognized character after (?< in "^www\.(?<domain>.+)$" at "domain>.+)$"


Example 2
------------------------------------------------
server {
server_name ^~www\.(?<domain>.*)$;
return 301 http://$domain;
}

server {
server_name ^~(?<domain_name>[^\.]*)\.(?<tld>[^\.]*)$;
location / {
proxy_pass http://websites;
}
}

## Error:
nginx: [emerg] unknown "domain" variable


thanks,
altimage