In order to customize the format for your input fields, you can set up conditions in the Pattern box.
Demonstration
Tutorials
Click on the Field widget > choose your own field type > Switch to Other Options Tab > Fill your Pattern format.
Detailed formats for demonstration:
[A-Z]* Uppercase letters are valid for your field.
[0-9]* Numbers are valid for your field.
^.{8,16}$ Limit min and max characters in Password Field.
^\d{5,7}$ Limit min and max number characters in Text Field.
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