All segments of URLs builded in Novius OS are cleaned by the friendly slug mechanism.
But you can use others rules or define your own rule. You can also have special rules for contexts.
Four setups of rules are defined:
A sample configuration file is available in local/config/friendly_slug.config.php.sample. Just rename (or copy) it to local/config/friendly_slug.config.php, and update it to your case.
To change the default setup of rules:
<?php return array( 'active_setup' => 'my_default', 'setups' => array( 'my_default' => array( // Use the 'no_accent' setup 'no_accent', // Replace space by '_' ' ' => '_', // All characters that are not a word character, a '-' or a '_' or a '*' are replaced by '-'. '[^\w\*\-_]' => array('replacement' => '-', 'flags' => 'i'), ), ), );