使用Ruby拆分CSV样式的字符串 [英] Split a CSV-style string with Ruby

问题描述

我有来自已加载到内存中的CSV文件的数据。所以我可能有这样的：

I have data from a CSV file that's already loaded into memory. So I might have something like this:

csv_string = 'Value 1,Value 2,"Hey, it\'s value 3!",Value 4 has "some quotes"'

显然我不想做 csv_string.split（，）。因为它似乎拆分一个CSV风格的字符串这种方式可能是一个不是所有的罕见的需要，我想知道是否有一个解决方案已经在那里。

Obviously I won't want to do csv_string.split(","). Since it seems like splitting a CSV-style string this way might be a not-all-that-uncommon need, I was wondering if there's a solution already out there.

推荐答案

对于解析CSV，Ruby附带了 csv 图书馆：

For parsing CSV, Ruby comes with the csv library:

require 'csv'

CSV.parse(csv_string)
# => [['Value 1', 'Value 2', "Hey, it's value 3!", 'Value 4 has "some quotes"']]

不幸的是，您的字符串实际上并不包含有效的CSV，因此您会真正获得的是以下异常：

Unfortunately, your string doesn't actually contain valid CSV, so what you'll really get is the following exception:

# CSV::MalformedCSVError: Illegal quoting on line 1.

由于你的数据实际上不符合任何通用标准，显然不能有一个通用的解析器，你必须自己编写。

Since your data doesn't actually conform to any common standard, there can obviously not be a common parser and you'll have to write your own.

或者，您可以将数据更改为有效的CSV，例如：

Alternatively, you could change your data to be valid CSV, for example like this:

c = %q[Value 1,Value 2,"Hey, it's value 3!","Value 4 has ""some quotes"""]

CSV.parse(c)
# => [['Value 1', 'Value 2', "Hey, it's value 3!", 'Value 4 has "some quotes"']]

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