pattern facet implementations

Hello,

 

Are there implementations of xsd:pattern facet available as stand-alone
or as a modular component that can be integrated into a test environment
or a schema processor?

 

I'd like to run tests on a pattern facet implementation and cross
reference the results with other implementations of this schema feature
for functionality and performance.

 

Also, are there XML Schema processors that use the same "engines" for
patterns? I'd rather test against different implementations rather than
the same one.

 

Thanks.

 

Shlomo.