form-xml-validation/src/main/resources/org/apache/struts/edit/action/EditAction-validation.xml

<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"
    "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
<validators>
  <validator type="requiredstring">
    <param name="fieldName">personBean.firstName</param>
    <message>First name is required.</message>
  </validator>
  <validator type="requiredstring">
    <param name="fieldName">personBean.lastName</param>
    <message>Last name is required.</message>
  </validator>
  <validator type="requiredstring">
    <param name="fieldName">personBean.email</param>
    <message>Email address is required.</message>
  </validator>
  <validator type="email">
    <param name="fieldName">personBean.email</param>
    <message>Email address not valid.</message>
  </validator>
  <validator type="requiredstring">
    <param name="fieldName">personBean.phoneNumber</param>
    <message>Phone number is required.</message>
  </validator>
  <validator type="regex">
    <param name="fieldName">personBean.phoneNumber</param>
    <param name="regex"><![CDATA[\d{3}-\d{3}-\d{4}]]></param>
    <message>Phone number must be entered as 999-999-9999.</message>
  </validator>
  <validator type="fieldexpression">
    <param name="fieldName">personBean.carModels</param>
    <param name="expression"><![CDATA[personBean.carModels.length > 0]]></param>
    <message>You must select at least one car model.</message>
  </validator>
  <field name="personBean.age">
    <field-validator type="required">
      <message>${getText(fieldName)} is required.</message>
    </field-validator>
    <field-validator type="int">
      <param name="min">1</param>
      <param name="max">120</param>
      <message key="age.error">${getText(fieldName)} must be from ${min} to ${max}</message>
    </field-validator>
  </field>
</validators>