tricky htaccess 301 redirect

hello there,

I need to set 301 redirect for selected urls only.

my old htaccess code is....

RewriteRule buy.php$ product.php?&%{QUERY_STRING}
RewriteRule buy.php$ product_details.php?&%{QUERY_STRING}

Code (markup):

obviously for one url it was giving 404-soft error becuase of two buy.php

so i changed one url as below.....

RewriteRule [B]buy-now.php[/B]$ product.php?&%{QUERY_STRING}
RewriteRule buy.php$ product_details.php?&%{QUERY_STRING}

Code (markup):

Now, google has already indexed old url.

How do i set 301 redirect for old url to new buy-now.php???

 

RewriteRule buy-now.php$ product.php?&%{QUERY_STRING} [R=301,L]
RewriteRule buy.php$ product_details.php?&%{QUERY_STRING} [R=301,L]

Code (markup):

 

no it did not work.

 

I am not a programmer but i use the following code for 301

options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host}^buy-now.php[nc]
rewriterule ^(.*)$ buy.php 1[r=301,nc]

try it........