Using struts validate mask with foreign characters

[mdjj]

I need to validate my web app for european characters. I can do it by allowing individual characters in the mask i.e.

<constant>
<constant-name>alphaForeignCheck</constant-name>
<constant-value>^[a-zA-Z è\s]*$</constant-value>
</constant>

This will allow for alphas and è. But rather than list individual foreign characters is there a way to group say all french all german characters?