python如何精確匹配

各位大蝦好！

小弟有一個(gè)文件里面是這個(gè)樣子：

data_center = { 
    access_key = {
        ak = "this is ak", 
        sk = "this is sk",
                },
    rc_server_port = 8989,
    rc_proxy_slb_port = 8990,               
}

region = {
    id = "8",
    access_key = {
        {ak = "this is ak", sk = "this is sk"},
    },
    rtsp_url_key = "6y7u8i9o0p",
}

我現(xiàn)在想獲取整個(gè)data_center這個(gè)節(jié)點(diǎn)的內(nèi)容，于是我就如下寫：

key_start = 'data_center'
key_end = '}'
pattern = re.compile(key_start+'(.*?)'+key_end,re.S)
result = pattern.findall(data)
print result

但是得到的結(jié)果是

[' \r\n\taccess_key = {\r\n\t\tak = "this is ak", \r\n\t\tsk = "this is sk",\r\n       \t\t ']

也就是說(shuō)匹配到了前一個(gè)“}，”而不是后面那個(gè)“}”，請(qǐng)問(wèn)我該怎么辦？

第二個(gè)問(wèn)題，我想得到的格式跟原來(lái)的一樣，還是json的格式，請(qǐng)問(wèn)我該怎么辦？