Get's the newest hash of the current CraftBukkit build.

rbcbhash.py

#!/usr/bin/python

import urllib
import re

page = urllib.urlopen('http://dl.bukkit.org/downloads/craftbukkit/list/rb/').read()

re1='.*?'	# Non-greedy match on filler
re2='(MD5)'	# Variable Name 1
re3='.*?'	# Non-greedy match on filler
re4='(Checksum)'	# Variable Name 2
re5='.*?'	# Non-greedy match on filler
re6='((?:[a-z0-9]{32}))'	# Alphanum 1

rg = re.compile(re1+re2+re3+re4+re5+re6,re.IGNORECASE|re.DOTALL)
m = rg.search(page)
if m:
    alphanum1=m.group(3)
    print alphanum1+"\n"