The condition Match Regex checks the input value for a specific field for a pattern, defined as Regex e.g. Check if the input is a valid email address or product code and otherwise remove access until this information is correct. This condition also applies the Regex to the value in the provided fieldpath and allows to either validate the value (regex validation) or to generate an output. Extract the Product Code from the filename and use it in the following transformations to e.g. apply tags for product attributes.