Someone

Default configuration
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RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]
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RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(dev)             <------------ Is this right? ( I want that dir. to be ignored ) 
RewriteRule ^(.*)$ /index.php/$1 [L]

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