Validate form input
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.
Set a validation rule
Click on the question or field you would like to add validation for and open the Validation section by clicking the
settings icon. Then, choose a Validation pattern.
Validate with Regular Expressions
Choose the Regex validation pattern to validate a form input with a regular expression. Regular expressions define 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 text length
Use the min and max length validation rules to specify the accepted length of text inputs.
Validate with logic
Choose the Condition validation pattern to validate a form input based on an arbitrary condition.
For example, here we specify that an input must contain either gmail or yahoo.
The Email input field type validates email addresses out of the box.
Custom error messages
Provide an Error message through the right-hand side settings to override the default warning message. For example, here we specified Your pin must be exactly 6 characters to be the error 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.