URL re-writing problem

I am using this below code to re-write URL :

RewriteEngine on    
RewriteRule ^buynow/(.*)$ Model/Public/BuyNow/buynow.php?str=$1&f=$2   [L]

But as in these lines,Second parameter "f" is not working here.I have searched on google开发者_运维知识库 but not getting result.Kindly give your suggestions

Thanks

You only have one group (delimited by ( ... )) in your regular expression. $1 refers to what was matched in this group, and $2 refers to what was matched in a second group, which doesn't exist. Because there is no second group, $2 will always evaluate to "".

What part of the URL is f supposed to represent?

EDIT: Based on your comments, it would seem the rule should look something like this:

RewriteRule ^buynow[^/]*/(.*)/([^/]*)$ Model/Public/BuyNow/buynow.php?str=$1&f=$2   [L]

You are only capturing one string, so there is no $2 corresponding to a second capture group.

The Rule you wrote supports the passing of 1 parameter only, the ^buynow/(.*)$ is one parameter which is not broken into 2, therefore your expected parameter will never arrive. Please post an example of the original URL so I can help you to resolve the issue.