htaccess file has no affect - php

Question

I'm trying to rewrite an url like this:
www.mywebsite.com/product/a-product-name-here/92341
to
www.mywebsite.com/our-products/a-product-name-here/92341
I'm using following rewriterule:
RewriteRule ^product/(.*)$ our-products/$ [R=301,L]
And according to this online tool it should do the trick. I've put this online, but it didn't affect anything.
AllowOverride is active on my host.
My folder structure is like this (tried the rewrite rule in both of the 2 .htaccess's):
UPDATE
This is the .htaccess content in the folder Corporate
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /corporate/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /corporate/index.php [L]
</IfModule>
# END WordPress
And this is the content of the .htaccess file in the product folder:
AddDefaultCharset utf-8
Options +FollowSymlinks
RewriteEngine on
RewriteRule ^(.+) index.php?a=$1 [nc]

Answer 1

Alright, as far as I understand, your problem can be divided into two parts.
Redirect public URL
You want the public URL example.com/product/foo-bar/1234 to be redirected to example.com/our-products/foo-bar/1234. This can be achieved with the already posted rule by anubhava, slightly modified to only match numbers:
Put it in your root .htaccess, besides index.php.
RewriteRule ^product/((.+)/(\d+))$ /our-products/$1 [R=301,L]
Map external URL to script, internally
Then, the external URL is example.com/our-products/foo-bar/1234, which does not physically exist on the server machine and therefore fails with a 404.
So you'll have to map it to the script containing the actual logic.
RewriteRule ^our-products/(.+)$ /product/index.php?a=$1 [L]
This is assuming that your script will accept the a parameter.
Your .htaccess files, after the changes
This is the .htaccess content in the folder Corporate
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^product/((.+)/(\d+))$ /our-products/$1 [R=301,L]
RewriteRule ^our-products/(.+)$ /product/index.php?a=$1 [L]
</IfModule>
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /corporate/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /corporate/index.php [L]
</IfModule>
# END WordPress
And this is the content of the .htaccess file in the product folder:
AddDefaultCharset utf-8
Options +FollowSymlinks