[eluser]WanWizard[/eluser]
What do you mean by "use in shopping carts"?
There are rules for product ID (default alpha-numeric, dashes, underscores, or periods) and project name (default alpha-numeric, dashes, underscores, colons or periods).
You can change these regex rules via
Code:
$this->cart->product_id_rules = '\.a-z0-9_-';
$this->cart->product_name_rules = '\.\:\-_ a-z0-9';