PYTHON

Question

例如，我有 3 个句子，如下所示，其中 1 个句子包含引文标记 (Warren and Pereira, 1982)。引文始终在括号中，格式如下：(~string~comma(,)~space~number~)

He lives in Nidarvoll and tonight i must reach a train to Oslo at 6 oclock. The system, called BusTUC is built upon the classical system CHAT-80 (Warren and Pereira, 1982). CHAT-80 was a state of the art natural language system that was impressive on its own merits.

我正在使用 Regex 仅提取中间句子，但它会保留打印所有 3 个句子。结果应该是这样的：

The system, called BusTUC is built upon the classical system CHAT-80 (Warren and Pereira, 1982).

Answer 1

text = "He lives in Nidarvoll and tonight i must reach a train to Oslo at 6 oclock. The system, called BusTUC is built upon the classical system CHAT-80 (Warren and Pereira, 1982). CHAT-80 was a state of the art natural language system that was impressive on its own merits."

您可以将文本拆分成一个句子列表，然后选择以“)”结尾的句子。

sentences = text.split(".")[:-1]

for sentence in sentences:
    if sentence[-1] == ")":
        print sentence

Answer 2

设置...代表感兴趣案例的 2 个句子：

text = "He lives in Nidarvoll and tonight i must reach a train to Oslo at 6 oclock. The system, called BusTUC is built upon the classical system CHAT-80 (Warren and Pereira, 1982). CHAT-80 was a state of the art natural language system that was impressive on its own merits."

t2 = "He lives in Nidarvoll and tonight i must reach a train to Oslo at 6 oclock. The system, called BusTUC is built upon the classical system CHAT-80 (Warren and Pereira, 1982) fgbhdr was a state of the art natural. CHAT-80 was a state of the art natural language system that was impressive on its own merits."

首先，要匹配引用在句末的情况：

p1 = "\. (.*\([A-za-z]+ .* [0-9]+\)\.+?)"

当引用不在句末时匹配：

p2 = "\. (.*\([A-za-z]+ .* [0-9]+\)[^\.]+\.+?)"

将两种情况与“|”结合起来正则表达式运算符：

p_main = re.compile("\. (.*\([A-za-z]+ .* [0-9]+\)\.+?)"
                "|\. (.*\([A-za-z]+ .* [0-9]+\)[^\.]+\.+?)")

运行:

>>> print(re.findall(p_main, text))
[('The system, called BusTUC is built upon the classical system CHAT-80 (Warren and Pereira, 1982).', '')]

>>>print(re.findall(p_main, t2))
[('', 'The system, called BusTUC is built upon the classical system CHAT-80 (Warren and Pereira, 1982) fgbhdr was a state of the art natural.')]

在这两种情况下，您都会得到带有引文的句子。

python 正则表达式 documentation and the accompanying regex howto 页面是一个很好的资源。

干杯

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