url redirecting through htaccess

i have hosted two sites on same server and i mange them giving folders for each domain. i want to site comes as

example.com/example
example1开发者_Python百科.com/example1

i want to come

example.com and example.com 

i come to know that htaccess url redirecting can do this but i have less idea about it. if there is some tutorial on php regular expression please let me know. some help is appreciable.

edited i solved this problem by putting .htaccess file in root and writing:

RewriteEngine On
#for example.com
RewriteCond %{HTTP_HOST}  example.com$ [NC]
RewriteCond %{REQUEST_URI} !^/example/.*$
RewriteRule ^(.*)$  /example/$1 [L]

when i hit example.com it works fine now. it access the folder /example. but i had a problem on a certain domain. i m using codeigniter and i have to redirect its request also so that it does not show

example.com/example/index.php/controller/

i want to show this:

example.com/controller/

hope some experts can help.

---

The .htaccess url redirecting is setup as a file in your main directory and your code can look something like this:

 # These redirects should do the trick :-)
 Redirect example.com/example http://www.example.com
 Redirect example.com/example1 http://www.example.com