Saxon regex output (ie, Input regex: [0-9]{4}-[0-9]{2}

Hi Folks,
 
I'm seeing lots of output to standard out when using Saxon along the
following lines;
 
Input regex: [0-9]{4}-[0-9]{2}-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2}
Output regex: [0-9]{4}-[0-9]{2}-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2}
Input regex: [0-9A-F]
Output regex: [0-9A-F]

and so on...

I may be wrong but I think Saxon is generating this (at least I can't find
or think of anything else that is!).

If that's the case, can I disable it? Did I indivertibly enable it?

Cheers,
Toby