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