---

layout: core-developers title: expression validator

expression validator

Description

A Non-Field Level validator that validates based on regular expression supplied.

Parameters

• expression - the Ognl expression to be evaluated against the stack (Must evaluate to a Boolean).

Examples

<validators>
      <validator type="expression">
         <param name="expression"> .... </param>
         <message>Failed to meet Ognl Expression  .... </message>
      </validator>
</validators>