validate integer with a comma thousands seperator using Validator

[fea jabi]

Using struts validator.

have to validate the user entered value.
The value entered should be a positive integer with a comma thousands 
seperator. the number need not be in thousands.

I have as below to check for positive integer without comma seperator. but 
not sure how to validate if the user entered value with a comma seperator?

i.e value like 25,349 // how to validate this?

<field property="hrs" depends="integer,validwhen">
               <msg name="integer" key="errors.notvalid"/>
               <msg name="validwhen" key="errors.notvalid"/>
               <var>
                   <var-name>test</var-name>
                   <var-value>(*this* >= 0)</var-value>
               </var>
           </field>

how to validate the user entered value with a comma seperator? Thanks.

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