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>
