以下列出驗證規則檔案中常見的驗證器及格式
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN" "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">
<validators>
<field name="param key">
<field-validator type="required">
<message>必填驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>必填字串驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="int">
<param name="min">0</param>
<param name="max">100</param>
<message>整數驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="date">
<param name="min">1990-01-01</param>
<param name="min">2010-01-01</param>
<message>日期驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="date">
<param name="min">1990-01-01</param>
<param name="min">2010-01-01</param>
<message>日期驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="fieldexpression">
<param name="expression">key1>key2</param>
<message>欄位運算式驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="email">
<message>電子郵件地址驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="url">
<message>網址驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="stringlength">
<param name="maxLength">100</param>
<param name="minLength">50</param>
<message>字串長度驗證器</message>
</field-validator>
</field>
<field name="param key">
<field-validator type="regex">
<param name="expression">[正規表示法]</param>
<message>正規表示法驗證器</message>
</field-validator>
</field>
</validators>