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I'm trying to parse a text file with name:value elements in it into lists with "name:value"... Here's a twist: The values will sometimes be multiple words or even multiple lines and the delimiters are not a fixed set of words. Here's an example of what I'm trying to work with...

listing="price:44.55 name:John Doe title:Super Widget description:This widget slices, dices, and drives your kids to soccer practice\r\nIt even comes with Super Widget Mini!

What I want to return is...

["price:44.55", "name:John Doe", "title:Super Widget", "description:This widget slices, dices, and drives your kids to soccer practice\r\nIt even comes with Super Widget Mini!"]

Here's what I've tried so far...

details = re.findall(r'[\w]+:.*', post, re.DOTALL)
["price:", "44.55 name:John Doe title:Super Widget description:This widget slices, dices, and drives your kids to soccer practice\r\nIt even comes with Super Widget Mini!"]

Not what I want. Or...

details = re.findall(r'[\w]+:.*?', post, re.DOTALL)
["price:", "name:", "title:", "description:"]

Not what I want. Or...

details = re.split(r'([\w]+:)', post)
["", "price:", "44.55", "name:", "John Doe", "title:", "Super Widget", "description:", "This widget slices, dices, and drives your kids to soccer practice\r\nIt even comes with Super Widget Mini!"]

which is closer, but still no dice. Also, I can deal with an empty list item. So, basically, my question is how do you keep the delimiter with the values on a re.split() or how do you keep re.findall() from either being too greedy or too stingy?

Thanks ahead of time for reading!

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2 回答 2

5

使用前瞻断言：

>>> re.split(r'\s(?=\w+:)', post)
['price:44.55',
 'name:John Doe',
 'title:Super Widget',
 'description:This widget slices, dices, and drives your kids to soccer practice\r\nIt even comes with Super Widget Mini!']

当然，如果您的值中有一些单词后跟冒号，它仍然会失败。

于 2013-02-05T19:21:12.867 回答
2

@Pavel 的答案更好，但您也可以将上次尝试的结果合并在一起：

# kill the first empty bit
if not details[0]:
    details.pop(0)

return [a + b for a, b in zip(details[::2], details[1::2])]
于 2013-02-05T19:22:37.390 回答