Struts 2 - Global Validation

[Arulmani V A]

Hi, 

How to do global validation in Struts 2 ? For example, in Struts 1, I can 
define all global regular expression validations in a file called 
validation-regexpr.xml such as :
<constant>
    <constant-name>alpha</constant-name>
    <constant-value>[A-Za-z]*</constant-value>
</constant>

The above global regular expressions can be reused in other validation files as 
follows : <var>
    <var-name>mask</var-name>
    <var-value>${alpha}</var-value>
</var>
Any help in this regard will be greatly appreciated.

Regards
Arul



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