.htaccess - Special 301 redirection rules -

i'm moving old site new domain , i've been trying make proper 301 redirect in .htaccess file accomodate kind of redirection rules below think i'm stumped.

new.com     --> new.com/main www.new.com --> new.com/main  old.com     --> new.com/main www.old.com --> new.com/main  old.com/*   --> new.com/* www.old.com/*   --> new.com/*  sub.old.com/*   --> sub.new.com/* 

for first part, seems code works:

# rewritecond %{http_host} ^new\.com$ [or] # rewritecond %{http_host} ^www\.new\.com$ # rewriterule ^/?$ "http\:\/\/new\.com\/main" [r=301,l] # rewriterule ^$ http://www.new.com/main [r=301,l] 

put simple, if browser requests page other old.com domain's homepage, i'd go new.com. if visit new.com, they'd redirected /main folder. however, i'm worried should ever explicitly visit new.com/main, they'd fall infinite redirect.

any appreciated.

this code needed on document_root/.htaccess on new.com:

options +followsymlinks -multiviews # turn mod_rewrite on rewriteengine on rewritebase /  rewritecond %{http_host} ^(www\.)?new\.com$ [nc] rewriterule ^$ http://new.com/main [r=301,l] 

this code needed on document_root/.htaccess on old.com:

options +followsymlinks -multiviews # turn mod_rewrite on rewriteengine on rewritebase /  rewritecond %{http_host} ^(www\.)?old\.com$ [nc] rewriterule ^$ http://new.com/main [r=301,l]  rewritecond %{http_host} ^(www\.)?old\.com$ [nc] rewriterule ^(.+)$ http://new.com/$1 [r=301,l]  rewritecond %{http_host} ^([^.]+)\.old\.com$ [nc] rewriterule ^$ http://%1.new.com/main [r=301,l]  rewritecond %{http_host} ^([^.]+)\.old\.com$ [nc] rewriterule ^(.+)$ http://%1.new.com/$1 [r=301,l]