The Duplicate Value Validator can be used to prevent duplicate value and to enforce an input format.
Figure 1: Configuration tab for Duplicate Value Validator
Example:
Implementing validation on field "phone" to make it as:-
- Mandatory,
- unique,
- and adhere to certain format using regular expression. (To learn more about Regular Expression, please visit http://www.regular-expressions.info/
)
Figure 2: Sample form
Figure 3: Sample configuration
Figure 4: Sample error on form