.htaccess rewrite rule to make longer url work - apache

Question

I have a rewrite rule that allows me to be able to have a url like this..
http://example.com/randyt
and convert it to
http://example.com/?aff=randyt
It's working however, I also have other links that need to be used such as....
example.com/members/aff/go/randyt
example.com/members
example.com/members/signup
and so on. The rewrite rule I have ignores those urls and just goes to
example.com
Please help me add something to this so it will not ignore any url with the /members or /members/.... in it.
Here is the code I am using now...
RewriteEngine On
RewriteBase /
# If the request is not for a valid directory
RewriteCond %{REQUEST_FILENAME} !-d
# If the request is not for a valid file
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule (.+) ?aff=$1 [L,QSA]
Sorry about the comments section I am new here lol.
So here is the above code with the added code that someone suggested
RewriteEngine On
RewriteBase /
# If the request is not for a valid directory
RewriteCond %{REQUEST_FILENAME} !-d
# If the request is not for a valid file
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule (.+) ?aff=$1 [L,QSA]
RewriteCond %{REQUEST_URI} ^/members
RewriteRule . - [L]
When I try to use the extended url it still goes back to the base url showing only index.php from the root directory.
When someone uses a url like this....
example.com/members/aff/go/randyt
I need it to stay in the members directory using that affiliate code. The current program should take care of that.
Here is the .htaccess code in the members directory
<IfModule mod_rewrite.c>
RewriteEngine on
# RewriteBase /members
RewriteRule ^public public.php [L]
RewriteRule ^js.php js.php [L]
RewriteRule !\.(js|ico|gif|jpg|png|css|swf|csv|html)$ index.php
</IfModule>
<IfModule mod_php5.c>
# php_flag magic_quotes_gpc off
</IfModule>
That code was pre-written by the company I purchased the program from.
So to sum this up, I need 2 different things to happen...
If someone uses:
example.com/randyt (randyt can be any username)
it needs to stay on example.com showing that page (index.php file)
If someone uses:
example.com/members/aff/go/randyt (again randyt can be any username)
it needs to stay in the members directory and use the purchased script.

Answer 1

Try this rule in /members/.htaccess:
DirectoryIndex index.php
RewriteEngine on
RewriteBase /members/
RewriteRule ^public/?$ public.php [L,NC]
# If the request is not for a valid directory
RewriteCond %{REQUEST_FILENAME} !-d
# If the request is not for a valid file
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]

Answer 2

You can add a condition to your .htaccess
RewriteCond %{REQUEST_URI} ^/members
RewriteRule . - [L]
This condition will check if the Requested URI contains a string starting with /member then it will be passed unchanged to its destination.