Python匹配和中间的返回字符串

我有以下代码

stringA = "xxxxxxFoundAaaaaaaaaaaaaaaFoundBxxxxxxx"
stringB = "FoundA"
stringC = "FoundB"

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如何在python中执行正则表达式以返回

aaaaaaaaaaaa

？

FAIL没有使用re.escape（）**如果使用

stringA=“xxxxxx foundaaaaaaaaafoundbaaaafoundbxxxxxx”

？？？

>>>
>>> stringA = "xxxxxxFoundAaaaaaaaaaaaaaaFoundBxxxxxxx"
>>> stringB = "FoundA"
>>> stringC = "FoundB"
>>>
>>> import re
>>> re.search(re.escape(stringB)+"(.*?)"+re.escape(stringC),stringA).group(1)
'aaaaaaaaaaaaaa'
>>>

re.search(re.escape(stringB) + "(.*?)" + re.escape(stringC), stringA).group(1)