remove index.php

RewriteEngine on

RewriteBase /

RewriteCond $1 !^(index.php|resources|robots.txt)

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^(.*)$ index.php/$1 [L,QSA]

http://www.phpcodify.com/remove-index-php-from-codeigniter-url/