Toolbox » Form Manager » Field Validation Options
To turn on and require validation rules for a form field, please go to Actions >> Validation Options:
Enable validation here:
Validation Rules:
Min/Max Characters
Restricts how many characters a field can have.
On the right side, the error message can be added.
It will look like this in the front end:
Numerical Value Range
Set numerical range this field's value needs to fall within.
It will look like this in the front end:
Regular Expression
This is an advanced setting for developers to input REGEX rules.
So for example, the regex that is in the placeholder above:
/^[a-zA-Z0-9_.]+$
It means that the content has to be any combination of lowercase or uppercase letters (A - Z), numbers, underscores, and periods.
No other characters would be accepted. Use without the leading or trailing slash /.
NOTE: If no error message is added, the system will show general error messages. These messages are text labels and are edited by going to Settings >> Text Labels.
Then at the right top in the search bar, please type "Form validation" and all labels related to these messages will show up.