Hi friends, i want to do a 301 redirect with htaccess in joomla but I can`t get it to work

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Wilson Calaham: Hi friends, i want to do a 301 redirect with htaccess in joomla.
  Both domains are on same host, the old one is parked on new one, no i want to make them point to new one.without loosing my 1000 pages of index in google with old domain.
  I have tried this below code
  Options +FollowSymLinks
  RewriteEngine on
  RewriteRule (.*) http://www[dot]newsite[dot]com/$1 [R=301,L]
  but it says
  This web page has a redirect loop
• 
  Tony McCreath: That redirects to itself, hence a loop. You will need to qualify it with only redirecting from the old site. Add this on the line before the RewriteRule:
  
  RewriteCond %{HTTP_HOST}  ;^www.oldsite.com$ [NC]
• 
  Wilson Calaham: You mean i add below code in custom redirect block ?
  
  Options +FollowSymlinks
  RewriteEngine on
  RewriteCond %{HTTP_HOST}  ;^www.nfc-forum.ir$ [NC]
  rewriterule ^(.*)$ http://www[dot]banksupply[dot]ir/$1 [r=301,nc]
• 
  Tony McCreath: Looks right
• 
  Wilson Calaham: Not working, it does nothing
• 
  Tony McCreath: You're right, but it looks good. Is it at the start of the .htaccess file? An error before it or other command may stop it working.
  
  Strange as without the condition you were getting a redirect loop which implies the  ;command without the condition was working.
  
  You're obviously showing code altered for the public (like the [dot]s) so I would double check your exact code, test and try variations to see what you can get working. ;
  
  Your also missing the L flag in your rule which means subsequent rules may overwrite it. Here's a possible improvement:
  
  RewriteCond %{HTTP_HOST}  ;^.*nfc-forum.ir$ [NC]
  RewriteRule ^(.*)$ http://www[dot]banksupply[dot]ir/$1 [R=301,NE,NC,L]
  
  Replacing the [dot]s with dots (.).
• 
  Wilson Calaham: If possible plz send me an email or private msg so i can share my whole htaccess file with you my email is h.m.island[@]gmail.com
  I think i make mistake