py中如何用正则表达式，获取一段字符串。
比如字符串：{"test":"a1b2c3","testtoo":123}，我想获取a1b2c3这部分字符串，怎么操作？谢谢。
[解决办法]

Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> txt = '{"test":"a1b2c3","testtoo":123}'
>>> import re
>>> r = re.search(r':"(\w+)"', txt)
>>> print r.groups()
('a1b2c3',)
>>> 

[解决办法]
何必呢？这不是一个字典的形式么？
>>> import json
>>> a='{"test":"a1b2c3","testtoo":123}'
>>> dict = json.loads(a)
>>> dict['test']
u'a1b2c3'
>>> dict['testtoo']
123