python使用正则表达式文本替换

# encoding: UTF-8import re# 将正则表达式编译成Pattern对象p = re.compile(r'(?P<folder>(/w+/)*)(?P<filename>/w+/.png)')# 使用Pattern匹配文本，获得匹配结果，无法匹配时将返回None#match = pattern.match('<key>xxx/duobaojiemian_L/yangpizi.png</key>')the_str = """<key>XXXX/duobaojiemian2222_L/duobaojiemian_L/yangpizi.png</key>    <key>yangpizi2.png</key>    <key>yangpizi3.png</key> """for m in p.finditer(the_str):  # 使用Match获得分组信息  PRint m.groupdict()print '-------------------------------'#f = lambda m: m.group().find('XXXX/') == -1 and 'XXXX/'+m.group() or m.group() def f(m):  s = m.group()  return s.find('XXXX/') == -1 and 'XXXX/'+s or sdef f2(m2):  d = m2.groupdict()  return d['folder']+'the_'+d['filename']print p.sub(f2, the_str)