Hey Jenda,

This is the one I was looking for. Pointing out the relative stupidity of my regex. I was checking for empty string, but then lost the fact that I didn't need to require the 'd' or 'h' portion, thus allowing for the deletion of the '|'. And at one point, I did correctly have the ^(?:...)$ wrapping the entire match, but lost it in one of my incantations.

So, the final form I've chosen is:

if ( $value and $value !~ /^(?:(\d+)d)?(?:\s*(\d+)h)?$/i )
   {
   $result  = "Please only enter time in one of these three formats: '
+3d', '4d 3h', '22h'";
   }
else
   {
   $day = $1 || 0;
   $hour = $2 || 0;
   }
[download]

And it seems to work!

Thanks,
LogicalChaos