[thredds] Collection Specification

Does the <featureCollection> <collection spec=""/> </featureCollection>
only support regular expresions in the filename section, or is it
suppose to support it in the directory path as well?
 
Trying to select subdirectories 1999-2009 only:
<collection
spec="//fgwfnas1/data/fnl/grib1/fnl[12][09][09][0-9].*/.*grib$"/>

readCatalog(): full path=C:\Tomcat\content\thredds\catalogs\f.xml;
path=catalogs/f.xml
readCatalog(): valid catalog -- ----Catalog Validation version 1.0.01
**Error: DatasetFmrc =fnl directory=
<//fgwfnas1/data/fnl/grib1/fnl[12][09][09][0-9].*> does not exist
 
Regards,
 
Glenn