common validator combine constants / constant-name

[userxxx <fi...@googlemail.com>]

Hello,
I want to to mix constants in the common-validator

I Use struts 1.2.9 and common-validator 1.3.1 on weblogic 10.3.2.0

Here is a simple  example:

validation.xmlfinalposter@googlemail.com
[...]
    <constant>
      <constant-name>K_alpha</constant-name>
      <constant-value>[A-Z]</constant-value>
    </constant>
    <constant>
      <constant-name>K_num</constant-name>
      <constant-value>[0-9]</constant-value>
    </constant>
    <constant>
    	<constant-name>K_alpha_num</constant-name>
    	<constant-value>(${K_alpha}|${K_num})</constant-value>
    </constant>
    <constant>
    	<constant-name>mask_alpha_num</constant-name>
    	<constant-value>^${K_alpha_num}+$</constant-value>
    </constant>
[...]


validation-form.xml
[...]
<var>
  <var-name>mask</var-name>
  <var-value>${mask_alpha_num}</var-value>
</var>
[...]

Using this mask mask_alpha_num does not work. 
Is it not possible to combine the constants K_alpha and K_num to a new
constant?


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