[Xsltforms-support] Validation with regex?

[Elias M. <eli...@gm...>]

Hi.

I'm trying to validate a field that holds a file name to be stored in
exist-db.  I want to ensure only characters, numbers, space and . , _ -
characters are allowed.  I know I can use not(contains()) like this:

<xf:bind nodeset="instance('local')/FileName" type="xsd:string"
required="true()"
constraint="not(contains(.,'!'))  and not(contains(.,'$'))"/>

but that means doing for every character not allowed.  Is there a better
way, like a regexp match?

Thanks.
Elias