How to calculate numbers of characters in a text box, and to make sure it is not lesser than or greater than a specific amount of numbers?
You would do show custom error when:
=(TextBox < 150 and TextBox > 350)
I believe you need to have text for the error or it won't work.
"Please use between 150 and 350 characters."
You have two options. The first involves creating a custom error that checks the length of the string. The second involves using the settings for a text field which includes a minimum and maximum text length for the field.
I am an Engineer on the Cognito Forms team