Form validation
Collect accurate information from your respondents by validating form inputs. Define validation rules using logic conditions, regular expressions or out-of-the-box validation rules.
What is form validation
Data validation in form building or simply form validation ensures that the responses matches certain predefined criteria before the form is submitted. This maintains the accuracy of the data and enhances security by avoiding the submission of incorrect, incomplete or harmful data.
Set a validation rule
Click on the question or field followed by its
settings icon to open the right-hand panel. Open the Validation dropdown and choose a Validation pattern.
Validate with Regular Expressions
Choose Regex validate a form input with a regular expression, which definse a rule for the type of input you want to accept. See here for a list of popular regular expressions. Here are some examples:
Purpose | Regular expression |
Whole numbers | ^\d+$ |
Alphanumeric without space | ^[a-zA-Z0-9]*$ |
Alphanumeric with space | ^[a-zA-Z0-9 ]*$ |
URL | https?:\/\/(www\.)?[-a-zA-Z0-9@:%.\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%\+.~#()?&//=]*) |
Decimal numbers | ^\d*\.\d+$ |
Whole and decimal numbers | ^\d*(\.\d+)?$ |
Copy and paste one of the regular expressions above into the Regex field. Test your form using the
Preview mode!
Validate with logic
Choose the Condition validation pattern to validate a form input based on an arbitrary condition. Click
Set conditional logic. For example, we only want to accept gmail or yahoo emails.
Validate text length
Use the min and max length validation rules to specify the accepted length of text inputs.
Custom error messages
Provide an Error message through the right-hand side settings to override the default warning message.
Testing validation logic
Go to
Preview mode and click on the Next or Submit button. You’ll see a warning message appear if your inputs don’t match your validation rules.