# How to use Validation rules during import
{% hint style="info" %}
**Prerequisite:** This tutorial assumes you know the basics of the import feature. If this is not the case you can learn the basics in other guides here: [How to use import](https://docs.struct.com/pim3/tutorials/helpful-guides/how-to-use-import)\
\
The tools this tutorial goes through are all found on the data mapping page of import
{% endhint %}
## Validation rules
When importing Text [attributes](https://docs.struct.com/pim3/fundamental-concepts/attributes) you can choose to add validation rules on the incoming values.
You can add these validation rules on a column by column basis. If you wish to add a validation rule to a column you can click the 'Validation Rules (0)' text to the right of the data mapping.
Data mapping during import
Clicking the 'Validation Rules (0)' text will open a new tab. In this tab you can add one or more validation rules to the specified [attribute](https://docs.struct.com/pim3/fundamental-concepts/attributes).
Your first choice is the kind of Validation mode you wish to use. You have two choices:
* Error - If validation rule does not hold for a row, it will show in the change cell and the [attribute](https://docs.struct.com/pim3/fundamental-concepts/attributes) will be ignored during import
* Warning - If validation rule does not hold for a row, a warning will be shown in that change cell.
This choice will determine how the system tells you a validation rule does not hold for a row.
Validation rule will warn if incoming text length is not less than 5
Next choice is the Validation type you wish to use. Once again you have two choices:
* Textstring length - How many symbols are in the text.
* Regular expression - If a regex pattern matches
Third you choose the condition, the condition will depend on the Validation type.
Having succesfully created a rule you can choose to add another rule to the column or click the green "Update rules"-button in the bottom-left corner.
## Warning & Error
Underneath is shown images of what it looks like if a Validation rule does not hold for warning and error respectively:
