regex - .htaccess rewrite subdomain to directory or to file depending on path -

when navigate sub.domain.com/path gets me domain.com/site.php?site=sub&page=path.

when path text.text want point domain.com/subdomains/sub/text.text can't work together.

rewritecond %{http_host} ^(.*)\.domain\.com$ [nc] rewritecond %{request_uri} !^(.*\..*)$ [nc] rewriterule ^(.*)$ site.php?site=%1&page=$1 [l] 

when path contains text.text apply rule:

rewriterule ^(.*)$ http://domain.com/subdomains/%1/$1 [p,l,nc,qsa] 

also how can make rule above work relative path (without http://domain.com/)?

update:

sub.domain.com -> site.php?site=sub sub.domain.com/path -> site.php?site=sub&page=path sub.domain.com/path.ext -> subdomains/sub/path.ext 

all above works, 1 more left:

sub.domain.com/constant/text.text -> constant/text.text 

that 1 above should apply if after constant text dot. if not rule should apply:

sub.domain.com/path -> site.php?site=sub&page=path  

you can use these 2 rules:

rewriterule ^(constant|site\.php$) - [l,nc]  # path no dot rewritecond %{http_host} ^(.+?)\.domain\.com$ [nc] rewriterule ^/?$ site.php?site=%1 [l,qsa]  rewritecond %{http_host} ^(.+?)\.domain\.com$ [nc] rewriterule ^([^.]+)/?$ site.php?site=%1&page=$1 [l,qsa]  # else i.e. path dot rewritecond %{http_host} ^(.+?)\.domain\.com$ [nc] rewriterule ^(.+)$ http://domain.com/subdomains/%1/$1 [p,l,nc]