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Struts 2 Zip Code Validator

<field name="ah.address.zip">

<field-validator type="required">
<param name="trim">true</param>
<message>Zip Code is required</message>
</field-validator>

<field-validator type="regex">
<param name="expression"><![CDATA[^\d{5}$]]></param>
<message>Zip Code must be 5 characters</message>
</field-validator>

</field>