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# 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>