#!/usr/bin/env python
     #
     # Copyright 2007 Doug Hellmann.
     #
     """Searching memory mapped files with regular expressions.
     """
     
     __version__ = "$Id$"
     #end_pymotw_header
     
     import mmap
     import re
     import contextlib
     
     pattern = re.compile(r'(\.\W+)?([^.]?nulla[^.]*?\.)',
                          re.DOTALL | re.IGNORECASE | re.MULTILINE)
     
     with open('lorem.txt', 'r') as f:
         with contextlib.closing(mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)) as m:
             for match in pattern.findall(m):
                 print match[1].replace('\n', ' ')