Duplicate Value Validator is used to prevent duplicate values and to enforce an input format.
Figure 1: Configuration Tab for Duplicate Value Validator
Example:
Implementing validation on field "phone" to make it:
- mandatory
- unique
- adhere to a specific format using a regular expression (more on Regular Expression at http://www.regular-expressions.info/)
Figure 2: Sample Form
Figure 3: Sample Configuration
Figure 4: Sample Error on Form