[Nutch-general] About regex in the crawl-urlfilter.txt config file

[Elwin]

# accept hosts in MY.DOMAIN.NAME
+^http://([a-z0-9]*\.)*MY.DOMAIN.NAME/

Will this pattern accept url like this http://MY.DOMAIN.NAME/([a-z0-9]*\.)*/?
I think it's not, but in fact nutch can crawl and get urls like that in
intranet crawl. Why?