#!/usr/bin/env python
# encoding: utf-8
#
# Copyright (c) 2010 Doug Hellmann.  All rights reserved.
#
"""Substitute based on patterns.
"""
#end_pymotw_header

import re

bold = re.compile(r'\*{2}(.*?)\*{2}', re.UNICODE)

text = 'Make this **bold**.  This **too**.'

print 'Text:', text
print 'Bold:', bold.subn(r'<b>\1</b>', text)