using custom Message with p:messages

[autobots]

Hey guys, i'm just learning JSF with primefaces.. And I need little help
I wanna validate the inputText so it could only contain numbers only.. I'm using f:validateRegex like this :

Code: Select all

   <p:inputText id="npm" value="#{tableManager.NPM}">
                        <f:validateRegex pattern="([0-9]{1,8})"/>
                        <f:ajax execute="@this" event="keyup" render="messages" />
                    </p:inputText>

<p:messages id="messages"/>

but I don't know how to change the error message if the message get rendered.. Anyone could help??
PS : Sorry for my baad English