URL rewrite for part of domain name - .htaccess

Question

I feel this should be an easy fix but I'm struggling to get it done right.
I have the URL:
http://www.testing.com/toursgbr/my-post
http://www.testing.com/toursgbr/my-post-2
I need to rewrite the URL to:
http://www.testing.com/tours/gbr/my-post
http://www.testing.com/tours/gbr/my-post-2
I got as far as the following:
RewriteRule ^toursgbr/(.*) /tours\/gbr/$1 [L]
This is what's currently in the htaccess file:
RewriteEngine on
ErrorDocument 404 http://www.ausweb.com.au/web-hosting
AddHandler server-parsed html
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
RewriteCond %{HTTP_HOST} ^seabreezepark\.com\.au$ [OR]
RewriteCond %{HTTP_HOST} ^www\.seabreezepark\.com\.au$
RewriteRule ^/?$ "http\:\/\/theseabreezepark\.com\.au\/" [R=301,L]
RewriteRule ^toursgbr/(.+)$ /tours/gbr/$1 [NC,L]
and got nowhere pretty fast. I just want to look for the word "toursgbr" and change it to "tours/gbr" in summary.

Answer 1

Put the Following code at root .htaccess file :
RewriteEngine on
RewriteBase /
RewriteCond %{THE_REQUEST} !\s/+tours/gbr/ [NC]
# the above line will exclude any request having tours/gbr/ from the follwoing rule.
RewriteRule ^toursgbr/(.*)$ tours/gbr/$1 [R=302,L,NE]
# the above line will change any requested url having toursgbr/ to be tours/gbr/ temporary
# and you can change it to permanent by changing [R=302,L,NE] to [R=301,L,NE]
# but check the code as it is first then change it
RewriteRule ^tours/gbr/(.*)$ toursgbr/$1 [L,NC]
# the above line will internally map any request having tours/gbr/ to its original path

Answer 2

Try :
RewriteRule ^toursgbr/(.+)$ /tours/gbr/$1 [NC,L]
Do not use the full url in rewrite target if you want to internally redirect /toursgbr/foo to /tours/gbr/foo without changing the url in browser.
Your corrected htaccess :
ErrorDocument 404 http://www.ausweb.com.au/web-hosting
AddHandler server-parsed html
RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_HOST} ^(www\.)?seabreezepark\.com\.au$
RewriteRule ^/?$ http://theseabreezepark.com.au/ [L,R=301]
RewriteRule ^toursgbr/(.+)$ /tours/gbr/$1 [NC,L]
# BEGIN WordPress
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]