File Mask / Filter

Hi,

I am trying to apply a single type filter on a folder. The format should be like 20120516_Title 1_Title_2.pdf. I am able to set a filter for the '_' characters (*_*_*.pdf), but not for numerical or dat values. For example ########_*_*.pdf. Is the a wildcard character for numerical values which will accomplish this? Or perhaps something like a long date?

Thanks in advance.

Gijs