我试图在CSV格式的字符串中处理未匹配的双引号.

确切地说,

"It "does "not "make "sense", Well, "Does "it"

应该更正为

"It" "does" "not" "make" "sense", Well, "Does" "it"

所以基本上我要做的就是

替换所有'''

1. 前面没有行开头或逗号(和)
2. 后面没有逗号或行尾

与'""'

为此,我使用下面的正则表达式

(?<!^|,)"(?!,|$)

问题是,虽然红宝石正则表达式引擎(http://www.rubular.com/)都能够解析正则表达式,蟒蛇正则表达式引擎(https://pythex.org/,http://www.pyregex.com/)抛出以下错误

Invalid regular expression: look-behind requires fixed-width pattern

并且使用python 2.7.3它会抛出

sre_constants.error: look-behind requires fixed-width pattern

谁能告诉我这里有什么烦恼？

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编辑:

在Tim的回应之后,我获得了多行字符串的以下输出

>>> str = """ "It "does "not "make "sense", Well, "Does "it"
... "It "does "not "make "sense", Well, "Does "it"
... "It "does "not "make "sense", Well, …