Apache Struts 2 Documentation > Home > Guides > Core Developers Guide > Validation > expression validator
Added by tm_jee, last edited by Philip Luppens on Feb 10, 2007  (view change) show comment

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>