Are regular expression lookups optimized in pound?  I.e are they put  
into a hash table of any sort, or are they scanned sequentially each  
time a new request comes in?  I have a 4600 line config file with  
around 270 different "HeadRequire "Host:.*xyz.foo.com" matches and  
was wondering if I'd see a performance difference between the first  
and last entries.

Thanks,
--Dave