You can use this cool regex functionality in Sheetgo forms to validate form inputs - in the example below we are validating a field so that it only allows numbers in that field
![](https://i.imgur.com/eIZFvv1.png)
If the user puts in an incorrect input the form will display an error message
![](https://i.imgur.com/5NIMIJWh.png)
Learn more on validations on Sheetgo forms by visiting this documentation