Product Code RegEx Validation

This module adds a new field called "Product Code RegEx Validation" on product categories. You can find it on the product category form, right after the parent category field.

When you enter a regular expression there, Odoo checks that it is a valid pattern. If the expression is invalid, you get an error and cannot save the category.

Once a category has a pattern, Odoo checks every product code (the internal reference) in that category. If a product code does not fully match the pattern, Odoo shows an error and prevents saving. This applies when you create or edit a product, and also when you change a product's category.

Products without a code, or archived products, are ignored by the check. The validation also runs when you change the pattern on the category itself, so existing products in that category must already comply.

The module touches the product, product variant and product category screens. It does not add new menus or reports; it only adds the extra field and the automatic checks.